The climate of the west coast of Africa is drier than that of the east ocean coast of the United States, even though they are located at similar northern latitudes because of the influence of ocean currents.
The ocean currents play a critical role in regulating the climate of coastal regions. The Canary Current flows from the north along the west coast of Africa, bringing cool water and air from the Atlantic Ocean.
This cooler air over the ocean leads to a stable atmosphere, which suppresses convection and limits the formation of clouds and rainfall. The warm Gulf Stream flows northward along the east coast of the United States, bringing warm, moist air from the tropics. This warm, moist air is unstable and easily rises, leading to the formation of clouds and precipitation.
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What does it mean even Amy is rock has an in aphanetic texture?
It seems like you're asking about a rock with an aphanitic texture and relating it to the term "Amy." An aphanitic texture refers to a fine-grained texture in igneous rocks where the individual mineral grains are too small to be identified with the eye. This texture is the result of rapid cooling of magma, usually occurring in volcanic environments.
As for the term "Amy," it is not directly related to geology or rock textures. It appears to be a proper name, which may have been included in the question by mistake. However, if we rephrase the question, we can understand it as: "What does it mean if a rock has an aphanitic texture, like the one Amy found?"
In this context, if Amy found a rock with an aphanitic texture, it suggests that the rock formed in a volcanic environment where the magma cooled quickly, resulting in fine-grained, indistinguishable mineral crystals. This type of rock could be basalt or andesite, both of which are common aphanitic igneous rocks. Examining the rock's composition and other characteristics would help in identifying its specific type.
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Are pyroclastic materials a significant component of shield volcanoes?
Pyroclastic materials are not a significant component of shield volcanoes. Shield volcanoes are characterized by their low-profile, broad, and gently sloping structure. They are primarily formed by the accumulation of fluid, basaltic lava flows, which are less viscous and spread out over large areas, creating the shield-like shape. The low viscosity of the lava allows gas bubbles to escape more easily, resulting in less explosive eruptions.
In contrast, pyroclastic materials are solid rock fragments and ash ejected during explosive volcanic eruptions. These materials can form pyroclastic flows, ash falls, or pyroclastic surges, and are typically associated with stratovolcanoes, also known as composite volcanoes. Stratovolcanoes have more viscous, silica-rich magma, which can trap gases, leading to explosive eruptions and the production of pyroclastic materials.
While it is possible for shield volcanoes to produce some pyroclastic material during their eruptions, this is not their primary output, and the presence of pyroclastic materials is relatively limited in shield volcanoes compared to stratovolcanoes. Thus, pyroclastic materials are not a significant component of shield volcanoes, as these volcanoes are mainly characterized by their non-explosive, basaltic lava flows.
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________ is the compass direction of the line produced by the intersection of an inclined rock layer with a horizontal plane.
A)Plunge
B)Angle
C)Strike
D)Dip
C) Strike is the compass direction of the line produced by the intersection of an inclined rock layer with a horizontal plane.
In geology, strike is the compass direction of the line formed by the intersection of a tilted rock layer or fault with a horizontal surface. It is measured as an angle in degrees, measured clockwise from north, with 0 degrees being north, 90 degrees being east, 180 degrees being south, and 270 degrees being west.
The strike line can be used to determine the orientation and direction of the rock layers or fault. It is commonly measured in the field using a compass or a clinometer, which can measure the angle of inclination of the rock layer or fault with respect to the horizontal surface.
Strike is an important property in geology, as it can provide information about the tectonic history and structural geology of an area. It is used in the construction of geologic maps, which show the distribution of different rock units and geological features in a given area.
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When was the Moscow Test Ban Treaty signed?
The Moscow Test Ban Treaty was signed on August 5, 1963. This treaty was signed by the United States, Soviet Union, and United Kingdom, and it banned all nuclear weapons tests in the atmosphere, underwater, and in space.
The signing of this treaty was a major milestone in the effort to control nuclear weapons during the Cold War. The treaty also paved the way for further disarmament talks and negotiations, and it helped to establish the framework for future arms control agreements. The Moscow Test Ban Treaty remains an important part of the international effort to prevent the spread of nuclear weapons and reduce the risk of nuclear war. The Moscow Test Ban Treaty, also known as the Partial Test Ban Treaty (PTBT), was signed on August 5, 1963. This agreement marked a significant milestone in international efforts to control nuclear weapons testing. The treaty prohibited nuclear tests in the atmosphere, outer space, and underwater, aiming to reduce the environmental and public health risks associated with radioactive fallout. The United States, Soviet Union, and the United Kingdom were the initial signatories, with many other countries joining over time. The treaty contributed to increased cooperation and dialogue among nations, paving the way for future arms control and disarmament measures.
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3. which city has the lowest annual rainfall? which city has the highest annual rainfall? (hint: remember you can hover the cursor over the appropriate dot on the dotplot.)
According to the dotplot, it appears that the city with the lowest annual rainfall is Las Vegas with only 4 inches of rainfall per year. On the other hand, the city with the highest annual rainfall seems to be New Orleans with over 60 inches of rainfall per year. It is interesting to note that the other cities on the dotplot fall somewhere in between these two extremes.
The low annual rainfall in Las Vegas is likely due to its location in the desert, where precipitation is scarce. In contrast, New Orleans is located in a region with a humid subtropical climate, which is characterized by high humidity and frequent rainfall.
Overall, the dotplot is a helpful tool for visualizing and comparing annual rainfall levels among different cities. It allows us to quickly identify the lowest and highest rainfall cities, as well as see how other cities compare.
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Less than 1% of volcano-related deaths are caused by ______ because they move very slowly.
Less than 1% of volcano-related deaths are caused by lava flows because they move very slowly. Volcanoes, which are openings in the Earth's crust, release molten rock, ash, and gases during eruptions.
These natural events can lead to various hazards, including lava flows, pyroclastic flows, ashfall, and volcanic gases. Lava flows are streams of molten rock that emerge from a volcanic vent and move across the landscape. Due to their high viscosity and slow movement, typically ranging from a few meters per hour to a few kilometers per hour, people can usually evacuate the area in time, resulting in fewer fatalities compared to other volcanic hazards. Although lava flows can cause significant property damage and alter the landscape, the risk of direct human fatalities remains relatively low. In contrast, pyroclastic flows, which are fast-moving, ground-hugging mixtures of hot gas, ash, and rock fragments, pose a much greater threat to human life. They can travel at speeds of up to 700 kilometers per hour and can reach temperatures of 1,000 degrees Celsius. As a result, pyroclastic flows are responsible for the majority of volcano-related deaths. In summary, less than 1% of volcano-related deaths are caused by lava flows due to their slow movement, which allows people to evacuate and avoid fatal encounters. Other volcanic hazards, such as pyroclastic flows, are more dangerous and deadly.
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How would you divide the United States into cultural regions?
Answer:
The United States can be divided into cultural regions based on a variety of factors, including history, geography, language, religion, and cuisine. One common method of dividing the United States into cultural regions is by using the nine regions defined by the Census Bureau: New England, Mid-Atlantic, South Atlantic, East South Central, West South Central, East North Central, West North Central, Mountain, and Pacific. These regions are based on a combination of historical settlement patterns, geographic features, and cultural characteristics. Another method is to use the concept of the "cultural hearth," which refers to the geographic origins of a particular culture or way of life. For example, the concept of the "Western" cultural region is often associated with the frontier and the cowboy way of life, while the "Southern" cultural region is associated with the Civil War and the legacy of slavery. Ultimately, any attempt to divide the United States into cultural regions will be somewhat arbitrary and subjective, and will depend on the specific criteria used.
Explanation:
Learning how to use ______ waves to predict volcanic eruptions is complex, since five different waves can be produced by numerous volcanic processes.
Learning how to use seismic waves to predict volcanic eruptions is complex, since five different types of waves can be produced by numerous volcanic processes.
Seismic waves are waves of energy that travel through the Earth's interior and can be detected and measured by seismometers.
They are generated by a variety of sources, including earthquakes, volcanic eruptions, and human activities such as explosions and mining.
The five types of seismic waves are primary (P) waves, secondary (S) waves, Love waves, Rayleigh waves, and long-period (LP) waves.
Each type of wave behaves differently as it travels through the Earth's interior, and can provide information about the structure and composition of the Earth as well as the nature of the seismic source that produced it.
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What is the rock name of an intermediate rock with two distinct grain sizes?
An intermediate rock with two distinct grain sizes is known as an intermediate porphyritic rock. This type of rock is characterized by having a fine-grained matrix or groundmass with larger crystals, known as phenocrysts, dispersed throughout. The phenocrysts are typically formed earlier than the matrix and can be of various minerals, such as feldspar, quartz, or mica.
The term "porphyry" comes from the Greek word "porphyra," which means "purple." This is because the first porphyritic rocks that were discovered had a purple-red color. However, porphyry can be found in various colors depending on the minerals that make up the rock.
Intermediate porphyritic rocks are classified based on their composition, which falls between felsic and mafic rocks. Felsic rocks are rich in silica, aluminum, potassium, and sodium, while mafic rocks are rich in magnesium and iron. Intermediate rocks have a balance of both types of minerals.
In conclusion, the rock name for an intermediate rock with two distinct grain sizes is intermediate porphyritic rock. This rock type is formed by the cooling and crystallization of magma or lava and is commonly found in volcanic and plutonic environments.
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Which of the following are common processes that alter the different sizes and shapes of sediments within the surf zone?
1. Rocks become smooth and flattened
2. Angular rocks are rounded, as their corners are knocked off
3. Sand forms from broken rock particles
Angular rocks are rounded, as their corners are knocked off is a common process that alters the different sizes and shapes of sediments within the surf zone.
Rocks becoming smooth and flattened is also a process that can occur, but it is typically associated with aeolian processes (wind erosion) rather than surf zone processes. The formation of sand from broken rock particles is not a process that alters the sizes and shapes of sediments within the surf zone; rather, it is the result of weathering and erosion occurring upstream from the surf zone.In the surf zone, sediments are constantly being moved and sorted by the energy of breaking waves. As waves approach the shore, they slow down due to the shallower water and increase in height, causing them to break. The energy from the breaking waves then moves the sediment around in a number of ways.One process that occurs is called abrasion, in which rocks and other hard materials become smoother and more rounded as they are rolled around by the waves. This is particularly true for angular rocks, which lose their sharp edges and become more rounded over time.
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Most ocean ridges coincide with ________.
A) divergent plate boundaries
B) convergent plate boundaries
C) oceanic plates
D) transforming boundaries
E) continental plates
Most ocean ridges coincide with option A) divergent plate boundaries.
These are areas where tectonic plates are moving apart from each other, allowing magma to rise up from the mantle and solidify to form new crust. As this process continues, the newly formed crust spreads outward, pushing the older crust aside and creating a ridge. This process is known as seafloor spreading and is responsible for the formation of new oceanic crust. Ocean ridges are also associated with volcanic activity and hydrothermal vents, where hot water and minerals are released from the Earth's interior. Understanding the dynamics of ocean ridges and plate boundaries is important for understanding the Earth's geology, as well as for predicting and mitigating the effects of natural hazards such as earthquakes and tsunamis.
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Why did the U.S. Geological Survey (USGS) issue a volcanic hazard warning for Mammoth Lakes in 1982?
The U.S. Geological Survey (USGS) issued a volcanic hazard warning for Mammoth Lakes in 1982 due to an increase in earthquake activity, ground deformation, and the release of volcanic gases. These factors indicated the potential for a volcanic eruption in the area, prompting the warning to ensure public safety and awareness.
The U.S. Geological Survey (USGS) issued a volcanic hazard warning for Mammoth Lakes in 1982 because of increased volcanic activity in the area. The warning was in response to a series of earthquakes and ground deformations that indicated a possible eruption from the Long Valley Caldera, which is located near Mammoth Lakes. The USGS also noted the presence of gas emissions and changes in the chemistry of the groundwater, which further supported the possibility of an eruption. As a result, the USGS advised residents and visitors to be prepared for a potential volcanic event and to be aware of the hazards that could result, including ashfall, pyroclastic flows, and lahars. Ultimately, no eruption occurred, but the warning served as a reminder of the potential risks associated with living near active volcanic areas.
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Land subsidence or ___ following an earthquake can cause land to become unusable because it is either flooded or left dry, respectively.
Land subsidence or uplift following an earthquake can cause land to become unusable because it is either flooded or left dry, respectively. This change in elevation can significantly impact the functionality and stability of the affected area.
Land subsidence is the gradual sinking or settling of the land surface. It is typically caused by a combination of natural and human factors, including groundwater pumping, soil compaction, natural compaction, and geologic processes.
Groundwater pumping is a major cause of land subsidence in many regions, as it can cause the water table to drop and the soil to compress. This is especially common in areas with high rates of agricultural irrigation, where large amounts of water are extracted from underground aquifers.
Soil compaction can also cause land subsidence, as heavy machinery, construction activities, and urbanization can compress the soil and cause it to settle over time. Natural compaction can also occur due to the weight of overlying sediments or the erosion of underlying bedrock.
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A measure decreases in the amount of outgassing from a volcano means that ______.
Soil in good condition for plant growth will be composed of ____.
A) ~95 percent organic matter
B) less than 1 percent water
C) ~50 percent water
D) less than 1 percent air
E) ~45 percent mineral matter
Soil in good condition for plant growth will be composed of a balanced combination of organic matter, water, air, and mineral matter.
Soil composition plays a crucial role in plant growth and development. A healthy soil must contain a balanced combination of organic matter, water, air, and mineral matter. The percentage of each component may vary depending on the type of soil and the plants that are being grown.
Organic matter provides essential nutrients and helps to improve soil structure, water holding capacity, and drainage. However, an excess of organic matter can lead to waterlogging and nutrient leaching, which can be detrimental to plant growth. Typically, soil in good condition for plant growth will have between 2-5% organic matter.
Water is also essential for plant growth, and soil that is too dry or too wet can cause problems. Soil in good condition for plant growth will typically contain around 25% water by volume.
Air is critical for root respiration and soil microbial activity. Soil in good condition for plant growth will have between 20-30% pore space filled with air.
Finally, mineral matter provides essential nutrients for plants to grow. Soil in good condition for plant growth will typically contain around 45% mineral matter.
Therefore, the correct answer to the question is a combination of all four components in a balanced proportion, rather than any one specific component.
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What is the most common indirect effect that volcanic activity can have on humans?
Volcanic activity can have a variety of indirect effects on humans, ranging from economic impacts to environmental changes. However, one of the most common indirect effects that volcanic activity can have on humans is the disruption of air travel.
When a volcanic eruption occurs, it can release large amounts of ash and other particles into the atmosphere. These particles can pose a significant threat to airplanes, as they can damage engines and other critical components. As a result, air travel in the vicinity of the eruption can be severely impacted, with flights being delayed, cancelled, or rerouted to avoid the affected area.This disruption of air travel can have significant economic consequences, as airlines may lose revenue and travelers may be stranded or forced to find alternative modes of transportation. Additionally, the disruption can have wider-reaching effects, as it can impact industries that rely on air transportation, such as tourism and global trade.While disruptions to air travel are the most common indirect effect of volcanic activity on humans, it is important to note that the impacts can vary widely depending on the specific characteristics of the eruption and the surrounding environment. As such, it is critical for scientists and policymakers to closely monitor volcanic activity and develop strategies to mitigate its potential impacts on human populations.
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The requirements for the building foundation will most likely be found on which sheet in a drawing set?
The requirements for the building foundation will most likely be found on the structural or foundation sheet in a drawing set.
This sheet typically includes details on footings, columns, walls, and other foundation elements needed to support the structure.
These sheets provide detailed plans and specifications for the design and construction of the building's foundation, including the types of materials, dimensions, and placement of footings and structural members.
It is important to carefully review these sheets to ensure that the foundation is built to code and can support the weight of the structure.
It will ensure a stable and strong foundation for the building.
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Large volcanoes that have a low, broad shape and are made of successive flows of low viscosity lava are called
a. stratovolcanoes.
b. shield volcanoes.
c. cinder cones.
d. ignimbrites.
e. composite volcanoes.
The correct answer is b. shield volcanoes. These types of volcanoes are typically found at hot spots or divergent plate boundaries, where magma is able to rise to the surface without much obstruction.
The lava that is released from shield volcanoes has a low viscosity, meaning it is thin and fluid, and is able to flow easily and cover large areas. Over time, the successive flows of lava build up a low, broad shape that is characteristic of shield volcanoes. In contrast, stratovolcanoes (e) are tall, steep-sided volcanoes that are built up by layers of both lava and ash. Cinder cones (c) are small, cone-shaped volcanoes that are made up of loose volcanic debris, while ignimbrites (d) are deposits of volcanic ash and other pyroclastic material that have been welded together by heat and pressure. Composite volcanoes (e) are another term for stratovolcanoes, as they are composed of layers of both lava and ash.
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What texture would you expect a thin, dark-coloured igneous sill across a valley to have?
If there is a thin, dark-colored igneous sill across a valley, we would expect its texture to be fine-grained. This is because igneous rocks form when molten rock or magma cools and solidifies. The texture of igneous rocks depends on the rate of cooling. If the cooling is slow, the crystals have more time to grow, resulting in a coarse-grained texture. However, if the cooling is rapid, the crystals have less time to grow, resulting in a fine-grained texture.
In the case of a thin sill, it is likely that the cooling was relatively rapid, as there was not enough volume of magma to retain heat and cool slowly. As a result, the crystals in the igneous rock would be smaller and the texture would be fine-grained. The dark coloration of the sill suggests that it is composed of mafic minerals such as pyroxene and olivine, which are characteristic of basaltic rocks. These minerals also tend to have a fine-grained texture.
Overall, we would expect a thin, dark-coloured igneous sill across a valley to have a fine-grained texture due to the rapid cooling of the magma that formed it.
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__________ is when various geologic materials exposed to the same environmental conditions will weather differently depending on their composition.
A) Hydrolysis
B) Chemical weathering
C) Differential weathering
D) Oxidation
E) Physical weathering
Differential weathering is when various geologic materials exposed to the same environmental conditions will weather differently depending on their composition. Therefore the correct option is option C.
Differential weathering is a process in which various geologic materials exposed to the same environmental conditions will weather differently depending on their composition.
This can result in the formation of unusual and distinctive landforms, such as the hoodoos in Bryce Canyon National Park, where harder and more resistant rock layers stand above softer, more easily weathered layers.
The differential weathering occurs because different rocks have different physical and chemical properties that affect how they respond to environmental forces such as wind, water, and temperature changes.Therefore the correct option is option C.
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Pyroclastic falls account for about ______ percent of volcanic deaths.
Pyroclastic falls are a common and deadly phenomenon associated with volcanic eruptions. They occur when volcanic ash and rock fragments are ejected from the volcano's vent and fall back to the ground due to gravity. Pyroclastic falls can travel long distances, burying everything in their path and causing significant damage and loss of life.
According to the United States Geological Survey (USGS), pyroclastic falls account for about 50 percent of volcanic deaths. This is because they can occur suddenly and without warning, making it difficult for people to escape in time. In addition, the high temperatures and toxic gases associated with pyroclastic falls can be deadly, causing burns, suffocation, and other health problems.
To protect themselves from pyroclastic falls, people living near active volcanoes should pay close attention to warning signs and evacuation orders issued by local authorities. They should also have an emergency plan in place and be prepared to evacuate at short notice. Additionally, people should avoid traveling to areas near active volcanoes during periods of heightened activity, as pyroclastic falls can occur at any time and can be extremely dangerous.
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examine the following maps to answer the questions below: plate boundaries, distributions of earthquakes, distributions of volcanoes, age of the sea floor, ocean floor features: describe the pattern of earthquakes that you see on the earthquake/global seismicity map.
The earthquake/global seismicity map shows a clear pattern of earthquakes occurring primarily along plate boundaries, with a higher frequency of seismic activity at areas where plates are actively colliding or diverging.
This is consistent with the theory of plate tectonics, which explains that earthquakes are caused by the movement and interaction of tectonic plates.
On the map, we can see that there are dense clusters of earthquakes at the boundaries of the Pacific Plate, the North American Plate, the South American Plate, and the African Plate, as well as along the Mid-Atlantic Ridge and the Antarctic Plate. These areas are marked by intense seismic activity and are known for being highly prone to earthquakes and other tectonic hazards.
In contrast, there are relatively few earthquakes occurring in the interiors of the plates, which tend to be more stable and less prone to seismic activity. This pattern highlights the importance of plate boundaries in the generation of earthquakes, and the role of tectonic forces in shaping the Earth's crust.
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A detrital sedimentary rock can be radiometrically dated because the clasts formed at the same time as the rock.
A)True
B)False
B) False. A detrital sedimentary rock cannot be radiometrically dated because the clasts are not the same age as the rock itself. Clasts can be derived from multiple sources and may have different ages than the rock they are found in.
A detrital sedimentary rock cannot be radiometrically dated accurately because the clasts within the rock were formed at different times, and not necessarily at the same time as the rock itself. Radiometric dating works best for igneous and metamorphic rocks, which form from cooling magma or high temperature/pressure conditions, respectively. In contrast, detrital sedimentary rocks form from the accumulation and compaction of pre-existing rock fragments (clasts) that have been transported and deposited in a new location, meaning their age is not representative of the rock as a whole.
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which of following rock types does NOT involve dissolved gas in the magma?
a. tuff
b. pumice
c. scoria
d. diorite
e. vesicular basalt
The rock type that does NOT involve dissolved gas in the magma is diorite (option d). Diorite is an intrusive igneous rock that is formed from the slow cooling
solidification of magma deep underground. Unlike volcanic rocks such as tuff, pumice, scoria, and vesicular basalt,
It forms from the slow cooling and solidification of magma deep within the Earth's crust. Unlike the other rock types listed in the question, diorite does not involve dissolved gas in the magma. Tuff, pumice, scoria, and vesicular basalt are all formed from volcanic activity, which involves the rapid cooling and solidification of magma that has dissolved gas (usually water vapor) in it. As the magma rises to the surface and encounters lower pressure, the dissolved gas comes out of solution and forms bubbles, creating a porous or vesicular texture in the resulting rock.
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(T/F) Earthquake induced forces is an example of gravity loading on a structure.
False, earthquake-induced forces are not an example of gravity loading on a structure. They are instead considered lateral or horizontal forces, also known as seismic loading, which act on the structure during an earthquake. Gravity loading refers to the vertical forces acting on a structure due to its own weight and the weight of its contents.
Gravity loading refers to the weight of the structure and any other loads that are caused by the force of gravity, such as the weight of people or objects inside the building. Earthquake-induced forces, on the other hand, are caused by the shaking and movement of the ground during an earthquake and are classified as lateral loads. These forces can cause significant damage to a structure, particularly if it is not designed to withstand them.
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Quartzite
A. always shows strong compositional banding.
B. breaks around the separate grains of quartz that compose it.
C. is basically a solid mass of interlocking quartz grains.
D. is always either white or gray.
Quartzite is basically a solid mass of interlocking quartz grains. Option C is correct.
Quartzite is a metamorphic rock that is formed from the metamorphism of quartz-rich sandstone. It is composed primarily of interlocking quartz grains and is extremely hard and durable. Unlike its parent rock, quartzite does not show any compositional banding, and it is not always white or gray. In terms of its texture, quartzite has a grainy or sugary appearance, and it often breaks through the quartz grains rather than around them. Therefore, the correct option is C - Quartzite is basically a solid mass of interlocking quartz grains. Quartzite is a hard, non-foliated metamorphic rock that is formed from the metamorphism of pure quartz sandstone or siltstone. It is composed of interlocking quartz grains that have been recrystallized and fused together. The recrystallization process that occurs during the formation of quartzite results in the interlocking of the quartz grains, which gives the rock its distinctive hardness, durability, and resistance to weathering.
Quartzite is available in a wide range of colors, including white, gray, yellow, pink, red, green, and blue. The colors of quartzite are determined by the presence of impurities, such as iron oxide, that were present in the original sandstone. These impurities can create a range of colors and patterns in the quartzite, making it a popular choice for decorative and ornamental purposes.
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You have found a Mafic rock with a phaneritic texture what is a potential Rock name?
If you have found a mafic rock with a phaneritic texture, it is likely that you have come across a type of igneous rock known as gabbro. Gabbro is a dark-colored rock that is rich in minerals such as pyroxene, plagioclase, and olivine.
The term "mafic" refers to the composition of the rock, which contains high amounts of magnesium and iron, and "phaneritic texture" refers to the coarse-grained, visible crystals that make up the rock. Gabbro forms deep beneath the Earth's surface through slow cooling of magma or lava. As the magma cools, mineral crystals begin to form and grow, resulting in a phaneritic texture. Gabbro is a common rock type in the oceanic crust and can also be found in continental crust. Gabbro is a valuable resource in construction and building industries due to its durability and strength. It is used as a building material, for crushed stone, and in the production of ceramics and glass. Additionally, gabbro has been used as a decorative stone in architecture and landscaping.
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12 part II) Examine each of the placemarks following the sedimentary structure GigaPan. Which of these four settings is most likely the sort of environment where the sedimentary structure you identified in the previous question would have formed?Group of answer choicesA) a river flowing into the seaB) a delta distributaryC) a glacial moraineD) a field of sand dunes
Based on the sedimentary structure observed in the GigaPan, the most likely environment where it would have formed is a delta distributary. Hence the correct option is B.
This is because delta distributaries are known for their complex sedimentary structures, with layers of sand, mud, and gravel deposited in a variety of ways. The branching channels of a delta distributary also create a lot of turbulence, which can help to sort and layer different types of sediment. In contrast, a river flowing into the sea would have a more straightforward sedimentary structure, with coarser sediments deposited closer to the river mouth and finer sediments further out.
A glacial moraine would have a different type of sedimentary structure altogether, with large boulders and rocks deposited in a chaotic pattern by a glacier. A field of sand dunes would also have a simpler sedimentary structure, with layers of sand deposited by wind in a relatively uniform pattern.
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how does the buoyancy of magma cause volcanic eruptions
Answer:
The magma rises and collects in chambers within the crust. As magma fills the chamber, pressure grows. If the pressure gets high enough, the magma can break through the crust and spew out in a volcanic eruption.
Explanation:
The eruption of Mt. St. Helens in 1980
A. was triggered by a landslide on its northern flank.
B. produced lava flows that traveled at the speed of sound and flattened forests.
C. occurred without warning, killing 60 people.
D. was the largest volcanic eruption ever recorded.
The eruption of Mt. St. Helens in 1980 was triggered by a landslide on its northern flank. Option A is correct.
On May 18, 1980, a massive landslide on the northern flank of Mount St. Helens caused a violent eruption, sending a plume of ash and gas more than 15 miles into the atmosphere. The landslide was triggered by an earthquake that caused the north face of the mountain to collapse, which in turn released a massive explosion of hot gas, ash, and rock. The eruption of Mt. St. Helens was one of the most destructive volcanic events in U.S. history, causing widespread devastation to the surrounding area and killing 57 people. While the eruption did produce pyroclastic flows, which are fast-moving clouds of hot gas and ash that can flatten forests, they did not travel at the speed of sound. The eruption was also not the largest volcanic eruption ever recorded.
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