Option a is Correct. A summit is a feature's largest dark contour line. Contouring is the term used to describe the process of utilizing contour lines to depict height on a map.
The 1400-foot contour is the darker contour line, which is also known as the index contour. Index contours, which are evenly spaced out, are helpful in visually determining the contour interval.
Any location on the lower index contour line that is numbered 500 is at a height of 500 meters above mean sea level. The 600 line, or 600 meters, represents the highest index contour line. Imaginary lines that connect locations with the same height above sea level are called contour lines.
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Correct Question:
What is a summit? question 5 options:
1. the greatest dark contour line on a feature
2. the contour line that circles the name of a mountain
3. the highest point of elevation on a feature
4. the lowest point of elevation on a feature
a literature review over tourism facilities
Find the missing length
The missing length of the triangle is 24 because these are congurent.
How do you determine a triangle's missing length?Presented with two sides, If leg an is the missing side, change the equation such that an is on one side and compute the square root of that number: a = √(c² - b²)The formula for a missing hypotenuse is c = (a2 + b2).When we know a triangle's three angles but not its sides, we say it's "AAA." Since there is no information to indicate size, AAA triangles are hard to solve further. We know their shape but not their size.Opposite side is 24 so, The missing length of the triangle is 24 because these are congurent.
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both volcanic rock and sedimentary rock can form in horizontal layers. which combination of rock features would convince you that a particular rock layer was of sedimentary origin?
Explanation:
A combination of the following rock features would convince you that a particular rock layer is of sedimentary origin:
Layering: Horizontal or roughly horizontal layering is a key characteristic of sedimentary rocks, whereas volcanic rocks often have a more chaotic texture.
Fossils: The presence of fossils, such as shells or plant remains, is a strong indicator of sedimentary rock.
Grains and clasts: The presence of distinct grains or clasts (fragments of other rocks) in the rock layer is a hallmark of sedimentary rocks. The size, shape, and sorting of these grains can also indicate the transportation and depositional processes that formed the rock layer.
Rock composition: Sedimentary rocks often contain minerals, such as quartz and calcite, that are not commonly found in volcanic rocks.
Stratification: The presence of cross-bedding, ripple marks, or other structures that suggest the rock layer was laid down gradually over time, is a strong indicator of sedimentary rock.
By combining these features, a geologist can make a strong case for the sedimentary origin of a particular rock layer.
Why would a region have relatively warmer weather during winter if it is next to an ocean?
Air from the equator pushes winds to different areas around the globe.
A region that is next to an ocean typically has relatively warmer weather during winter because of the moderating effect of the ocean.
The ocean acts as a large heat sink, absorbing heat from the sun during the summer and releasing it during the winter. This helps to balance the temperature extremes of land masses and results in a milder climate for coastal regions.
Another factor that contributes to warmer winter temperatures in coastal regions is ocean currents. Ocean currents distribute heat around the planet and can bring warm water to coastal regions, further moderating the climate. For example, the Gulf Stream brings warm water from the Gulf of Mexico to the east coast of North America, helping to keep temperatures in that region relatively mild during the winter months.
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The Earth' core ha an etimated temperature between 7,000-12,000 degree F, imilar to the urface of the Sun. Which of thee i the mot ignificant reaon why Earth' interior i hot?
Select one:
heat from material liding pat each other a they ort by denity, like when iron ink down pat le dene material. Heat leftover from when the planet wa formed, like when planeteimal lammed together. Heat from hydrothermal vent and ubduction zone, like when oceanic crut melt to fuel volcanoe. Heat from the decay of radioactive element, like when uranium decay to lead and give off energy
The most significant reason why Earth's interior is hot is because of heat from the decay of radioactive element, like when uranium decay to lead and give off energy.
Thus, the correct option is D.
It tаkes а rаther long time for heаt to move out of the eаrth. This occurs through both "convective" trаnsport of heаt within the eаrth's liquid outer core аnd solid mаntle аnd slower "conductive" trаnsport of heаt through non-convecting boundаry lаyers, such аs the eаrth's plаtes аt the surfаce. Аs а result, much of the plаnet's primordiаl heаt, from when the eаrth first аccreted аnd developed its core, hаs been retаined.
There аre three mаin sources of heаt in the deep eаrth:
heаt from when the plаnet formed аnd аccreted, which hаs not yet been lost; frictionаl heаting, cаused by denser core mаteriаl sinking to the center of the plаnet; аnd heаt from the decаy of rаdioаctive elements.Your options aren't well arranged, but most probably your options were
a. heat from material sliding pat each other as they sort by density, like when iron ink down pat le dene material.
b. heat leftover from when the planet was formed, like when planetesimal lammed together.
c. heat from hydrothermal vents and subduction zone, like when oceanic crust melts to fuel volcanoes.
d. heat from the decay of radioactive element, like when uranium decay to lead and give off energy
Thus, the correct option is D.
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What phase of the moon sets at dawn?
The best effects occur when the full moon rises at dusk and sets at morning.
What is moon?The Moon is Earth's only genuine satellite. It is the largest relative to its parent planet and the fifth largest satellite in the solar system, with a diameter that is nearly one-fourth that of Earth. There isn't much of a magnetic field, hydrosphere, or atmosphere. It has a gravity that is around one-sixth that of Earth, with a surface gravity of 0.1654 g. The only satellite in the Solar System known to have a higher gravity and density is Jupiter's moon Io. The Moon orbits Earth on average at a distance of 384,400 km, or around 30 times the diameter of Earth. The tides on Earth are primarily caused by its gravitational attraction, which also gradually lengthens the day.
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identify the germ layer from which each of these organs or tissues is derived?? . write endo for endoderm, ecto for ectoderm and meso for mesoderm
The liver, pancreas and trachea are derived from the endoderm (endo), while the brain and spinal cord are derived from the ectoderm (ecto). The mesoderm (meso) gives rise to the heart, blood vessels, muscles, and bones.
In human embryology, the germ layers refer to the different areas of the embryo that will eventually become different organs and tissues. The three germ layers are the endoderm, ectoderm, and mesoderm. The endoderm is the innermost layer and it forms the lining of the digestive and respiratory systems, as well as the organs associated with them. It also forms the thymus, thyroid, and parathyroids. The ectoderm is the outermost layer of the embryo and forms the structures of the nervous system, skin, and sense organs. It is responsible for the formation of the lens of the eye, the enamel of the teeth, and the hair. The mesoderm is the middle layer and it forms the structures of the circulatory and urogenital systems, including the heart, blood vessels, skeletal muscles, and bones. It also forms the pancreas, kidneys, and gonads.
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if you are the president of the philippines, what improvements will you do for the country essay
As President of the Philippines, we must develop the nation's infrastructure. The Philippines has invested little in physical capital compared to other regions over the past two decades, so there is an opportunity to accelerate growth through infrastructure investment. Second, the Philippines must maintain high productivity growth.
As President of the Philippines, I need to see what the Philippines is doing to improve its economy in the future. Here are his three key policy reform areas to maintain high growth and high productivity, and prerequisites for achieving Ambisyon Natin 2040:
(i) Improving market competition through regulatory reform; (ii) improve policies and regulations on the trade and investment environment; (iii) reducing labor market rigidity and costs; The president's most important role is to enforce the laws passed by Congress. To this end, the President heads 15 Cabinet departments and about 3 million civilians who work for the federal government.
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Please answer my question
Map scale is given.
[tex]1:1.000.000[/tex]The magnitude of the distance between two cities according to the map scale is also given.
[tex]3.5cm[/tex]Using these information, we will find the magnitude of the distance between two cities in centimeters and convert it to kilometers. To convert to kilometers we need to multiply the result by [tex]10^{-5}.[/tex]
[tex](3.5cm)(1.000.000)=3.500.000cm[/tex][tex]3.500.000cm = (3.500.000cm)(10^{-5})km[/tex][tex]3.500.000cm=35km[/tex]The result should be [tex]35km.[/tex]
corexit was:invented by nasa to help cool the earth's atmospherea breakthrough pharmaceutical druga type of specialty bolt that was invented to fix the citicorp buildinga highly toxic, experimental oil dispersant that was used by bp in the aftermath of the deepwater disaster
The statement "Corexit was invented by NASA to help cool the earth's atmosphere breakthrough pharmaceutical drug type of speciality bolt that was invented to fix the Citicorp building a highly toxic, experimental oil dispersant that was used by BP in the aftermath of the deepwater disaster" is false because Corexit wasn't invented by NASA but by Nalco company.
COREXIT 9500 is the chemicаl dispersаnt currently being used in the Gulf in аttempts to remedy the Deep Wаter Horizon spill. It is produced by the Nаlco compаny.
The ingredients of COREXIT 9500 are butаnedioic аcid (а wetting аgent in cosmetics), sorbitаn (found in everything from bаby bаth to food), аnd petroleum distillаtes in vаrying proportions, аnd it decomposes аlmost entirely in 28 dаys. The concentrаtions, however, аre still being considered а trаde secret аnd thаt informаtion hаs yet to be releаsed. Millions of liters of dispersаnts hаve now been used to breаk up the oil spilling into the Gulf of Mexico, mаking this the lаrgest use of such chemicаls in U.S. history.
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How will foliation in continental metamorphic rocks formed during subduction be oriented?
Foliation, which frequently occurs perpendicular to the direction of initial stress, records the direction of shortening.
Does tenseness signify stress?
Whether it be mental or physical, stress is a state of strain. It may be the outcome of anything that makes you angry, frustrated, or uneasy about a situation or way of thinking. Stress is your body's reaction to a demand or task. Short-term stress may be advantageous, for example, when it helps you stay safe or meet a deadline.
anxiety that keeps you from relaxing. She obviously feels anxious about her job.
Tension headaches arise when the neck and head muscles are stressed or contract. Muscle spasms may occur as a result of stress, hopelessness, a concussion, or worry.
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________ was an important eighteenth century english geologist and proponent of uniformitarianism. group of answer choices james hutton isaac newton james ussher charles lyell
James Hutton was an important eighteenth century english geologist and proponent of uniformitarianism.
Scottish geologist James Hutton also worked as an agriculturalist, chemist, naturalist, and doctor. He was instrumental in making geology a modern discipline and is frequently referred to as the "father of modern geology".
Hutton promoted the notion that clues in today's rocks might be used to deduce the distant past of the physical universe.
He established the hypothesis that geological structures could not be static but rather experienced continuous modification over infinitely long periods of time by studying characteristics in the terrain and beaches of his home Scottish lowlands, such as Salisbury Crags or Siccar Point.
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volcanic rocks derived from the yellowstone hot spot get progressively older to the southwest. based on this information, in which direction is the north american plate moving?
The North American Plate is moving to the southeast.
The Yellowstone hot spot is leaving a trail of progressively older rocks to the southwest, indicating the North American Plate is moving in a southeast direction.
North American PlateThe North American Plate is moving to the southeast in relation to the Yellowstone hot spot. The Yellowstone hot spot is leaving a trail of progressively older rocks to the southwest, which indicates that the North American Plate is slowly but steadily moving in a southeast direction. This motion is known as plate tectonics, which is the gradual movement of the Earth's crustal plates and is responsible for many of the Earth's geological features. The movement of the North American Plate to the southeast is a result of the convection currents within the Earth's mantle that cause the plates to slowly shift and drift.
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Which of the following statements is true of the Midwest farms
what is a similar driver for both monsoons and land breezes?
By causing low-level air to move from the water to the land due to these pressure differences, the sea breeze, an onshore wind, is created. When the circulation is reversed at night, land cools more quickly than nearby water and an onshore flow known as the land breeze results.
Sea and land breezes resemble monsoon winds, but monsoon winds are stronger. This indicates that monsoon winds happen frequently. Similar to how a sea breeze blows in a specific direction (from sea to land) during the day, monsoon winds in India during the summer blow south-west.
Dry winds typically blow from land breezes. As a result of the particles absorbed from the water bodies, sea breeze has a higher moisture content. Thus, both the land wind and the sea breeze occur close to bodies of water. However, compared to sea breezes, land breezes move more slowly.
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why are oceans considered the last unexplored frontier sr 15 a
Oceans are often referred to as the last unexplored frontier on earth. This means that despite the advances in technology and human knowledge, the vastness of the oceans still holds many mysteries and secrets that are yet to be uncovered.
The first reason is the sheer size of the oceans. It is estimated that nearly 71% of the Earth's surface is covered by oceans, making it the largest single environment on the planet. This vast area makes it difficult for scientists to fully explore and understand all of its components. The depths of the oceans are also largely unknown, with only about 5% of the ocean floor having been explored.Another reason for the oceans being considered the last unexplored frontier is the harsh and unforgiving conditions that exist there. The ocean floor is incredibly dark, cold, and under immense pressure. This makes it challenging for humans and technology to operate and gather data. The technology that is currently available for deep-sea exploration is also limited, and it is difficult to study the diverse and complex ecosystems that exist in the ocean.In addition to the size and conditions, the oceans are also difficult to study because they are constantly changing. The ocean currents, tides, and winds are all powerful forces that can impact the environment, making it challenging to track and monitor changes. The ocean also contains many unknown and potentially dangerous species, which can make exploration dangerous.Finally, the cost of ocean exploration is also a major factor that has limited the amount of research that has been conducted in the ocean. Exploring the depths of the ocean requires specialized equipment, ships, and personnel, making it a very expensive venture.To learn more about the ocean here:
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how does a core sample from the ocean floor reveal a past earthquake event?
It leads upto the Megathrust earth quake the tectonic plates. This is how core sample from the ocean floor reveal a past earthquake event.
Any sudden ground trembling caused by seismic waves traveling through the planet's rocks. Seismic waves are produced when a form of energy stored within the Earth's crust is suddenly released, typically when large masses of rock rubbing up against one another suddenly fracture and "slip." Earthquakes most frequently occur along geologic faults, which are small regions where rock masses can move relative to one another. The majority of the major fault lines in the world are located in the largest tectonic plates that make up the Earth's crust. (Check out the list of large earthquakes.)
Little was known about earthquakes before the advent of seismology at the turn of the 20th century. The comprehensive examination of earthquakes by science is
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True or Fale: Unlike other peninula throughout the world, there are no natural lake or major river on the Arabian Peninula
Answer: True
Explanation:
The Arabian Peninsula contains wadis, which are valleys or dry river beds that only fill with water during times of heavy rain or flooding.
which of these approaches would be helpful strategies for observing landscapes?
There are several approaches that can be helpful strategies for observing landscapes:
Slow and intentional observationMultiple perspectivesUse of multiple sensesComparison with other landscapesAttention to change over timeThese approaches are discussed below:
Slow and intentional observation: Taking the time to carefully observe a landscape, paying attention to details and patterns, can help to deepen one's understanding of the environment.
Multiple perspectives: Viewing a landscape from different angles and heights can provide a more complete understanding of its features and relationships.
Use of multiple senses: Engaging multiple senses, such as sight, sound, and touch, can help to build a more complete sensory experience and understanding of a landscape.
Comparison with other landscapes: Comparing a landscape to others that are similar or different can provide valuable insight into its unique features and characteristics.
Attention to change over time: Observing a landscape at different times of the day, in different seasons, or over a longer period of time can help to understand its dynamic nature and how it changes over time.
These approaches can help to build a more complete and nuanced understanding of a landscape and its features, allowing for a deeper appreciation of the environment and its natural and cultural significance.
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which term refers to the area of the world being studied
The term that refers to the area of the world being studied is "region."
A region is a geographical area that has common characteristics, such as physical features, cultural traits, economic activities, or political boundaries, that distinguish it from other areas. For example, a region can be defined based on geography, such as a mountain region, a coastal region, or a desert region.
It can also be defined based on cultural or political boundaries, such as a religious region, a linguistic region, or a nation-state region.
The study of regions is an important part of geography and helps us to understand and compare different parts of the world and their relationships with each other.
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What are 4 forms of evidence that support Pangea?
The fit of the continents, the distribution of prehistoric fossils, rocks, and mountain ranges, as well as the placements of prehistoric climatic zones, were all used as evidence for continental drift.
What is forms of evidence that support Pangea?Alfred Wegener gathered a variety of proof for his idea, including fossil and geological "fit" proof. It is crucial to note that Wegener did not cite the following specific fossil evidence to back up his theory.
Wegener did not personally collect the fossils, but he raised the possibility of leveraging the scientific evidence that certain species had left fossils on several continents to support his argument.
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The passage suggests that Martinson believes which of the following about deep waters in the Antarctic region?
A) They rise to the surface more quickly than they would if global warming were to occur.
B) They store heat that will exacerbate the effects of increases in atmospheric temperatures.
C) They would be likely to be significantly warmed by an increase in atmospheric temperatures.
D) They would be more salty than they currently are if global warming were to occur.
E) They are less likely to be stirred up when surface waters are intensely salty than when surface waters are relatively unsalty
The passage suggests that Martinson believes option c They would be likely to be significantly warmed by an increase in atmospheric temperatures.
Martinson believes that less ice forming due to global warming equals less heat brought up from the deep water.temperature of the oceans and atmosphere of the Earth, which is thought to be permanently altering the climate.People contribute to this by: not driving their cars everywhere, but riding bikes instead, planting more trees, reducing waste, and conserving water.
The term "global warming" refers to the extreme heat that the earth has experienced as a result of human activity.The Earth's climate system has been experiencing long-term heating, which is referred to as global warming.Since the pre-industrial era, this has been observed, and it is caused by human activities like burning fossil fuels in particular.
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Russia's huge oil boom caused Russia's economy to what?
Answer:
High oil prices can drive job creation and investment as it becomes economically viable for oil companies to exploit higher-cost shale oil deposits. However, high oil prices also hit businesses and consumers with higher transportation and manufacturing costs.
Explanation:
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What is the definition of a mixture? Give some examples.
Answer: a substance made by mixing other substances together:
"form the mixture into a manageable dough" · "shandy is a mixture of beer and lemonade"
Explanation: the internet?
People are hired by employers. Being employed is a conditional state. A more exact use of the word is employ, which signifies job or service. Statements like "in their employ" almost often refer to the word in this meaning.
A Conditional Call Option: What Is It?
A substitute, non-callable bond with a comparable maturity and yield must be provided to the bondholder if the bond issuer calls the bonds away before they mature. This type of option is called a conditional call. Conditional call provisions are meant to protect investors in the event that their high-yield bonds are called well before maturity. Bonds are a popular choice among investors who want assets with a fixed income and maturity date.
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according to dr. lawhead, in his presentation "climate change by design," what natural model can scientists study to understand the impacts of sulfur aerosol injection on the climate?
Scientists can study the natural model of volcanic eruptions to understand the impacts of sulfur aerosol injection on the climate according to Dr. Lawhead.
Volcanic eruptions provide a natural model for the study of sulfur aerosol injection and its effects on the climate. The sulfur dioxide emitted by a volcanic eruption reacts with the atmosphere to form sulfate aerosols, which can reflect sunlight and cool the planet.
Scientists can use this model to understand the potential cooling effects of intentionally injecting sulfur into the atmosphere, which has been proposed as a method of mitigating the effects of climate change. By studying volcanic eruptions and the cooling effect that follows, scientists can gain valuable insights into the potential benefits and drawbacks of such a climate intervention.
However, it is important to note that volcanic eruptions and intentional sulfur injection would have different amounts, duration, and elevations of sulfur release and therefore would have different climate effects.
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1. Assume that a parcel of air is forced to rise up and over a 3000-meter-high mountain as shown below. The intitial temperature of the parcel at sea level on the windward side is 35°C, and the (LCL) of the parcel is 2000 meters. The DAR is 10°C/1000 meters and the SAR is 6°C/1000meters. Assume that the condensation begins at 100% relative humidity and that no evaporation takes place as the parcel decends. Refer to Lab 16 (pages 93-95)- 10 points3000 meters2000 meters1000 metersWindSea Levela. What is the temperature of the parcel of air at the following elevations as it rises up the windward side of the mountain: 1.1000 m___2. 2000m___ 3. 3000m___b. What is the temperature of the parcel of air at the following elevations as it decends down on the leeward side of the mountain: 4. 2000 m___ level 5. 1000 m___ 6. At seac. Above the LCL the rising air will begin cooling at the___ (dry or saturated) adiabatic rate?d. At 2000 m, is the relative humidity of the parcel of air 100%? YES or NO (circle one) e. What is the source of heat energy as it decends down on the leewardside? f. Which side has the warmer temperature____(winward or leeward)?
The temperature of the parcel of air at the following elevations as it rises up the windward side of the mountain: 1.1000 m_is 71°F. 2. 2000m is 74.5°F. and 3. 3000m is 100°F.
The temperature at 3000 meters will be nearly 7 points C. The soggy adiabatic lapse rate is likely as 5 deg C/1000 meters, so if you climb 1000 meters, the air will calm 5 grades. The climbing air bunch, extending and abating as it moves upward, has a hotness of 59 points F at 2000 extremities (the hotness has ruined 5.5 points F per 1000 extremities or a total of 11 grades F).
Since atmospheric pressure decreases accompanying elevation, so excessively must the pressure of the climbing air piece. As air ascends, it expands. And as it expands, it cools. And the larger the group rises, the refrigerator it enhances. As air rises, air pressure at the surface is reduced. Rising air expands and cools (adiabatic abating: namely, it cools on account of change in the book as opposed to accumulating or taking away heat). The result is abridgment/snow. Cold air sinks.
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how are people living near the great lakes impacted by the weather changes related to presence of a large body of water
Answer:
People living near the Great Lakes are affected by weather changes related to the presence of a large body of water in several ways:
Moderation of temperature: The Great Lakes act as a thermal buffer, moderating the temperatures in nearby areas and reducing the severity of temperature fluctuations.
Humidity: The Great Lakes contribute to higher humidity levels in the surrounding regions, leading to increased cloud cover, fog, and precipitation.
Severe weather: The Great Lakes can also increase the frequency of severe weather events such as thunderstorms, tornadoes, and heavy rain due to the presence of large amounts of moisture in the air.
Lake-effect snow: The Great Lakes can cause heavy snowfall in areas downwind from the lakes, known as "lake-effect snow," which can have significant impacts on transportation, commerce, and daily life for people in these areas.
These are some of the ways in which the weather patterns near the Great Lakes are influenced by the large bodies of water and can impact the lives of people living in these regions.
melissa is from australia and is planning to visit georgia during an upcoming family vacation. all she knows is that georgia is located in the united states of america. which of the following responses would best explain georgia's location to melissa? a. georgia is located in the northern and eastern hemispheres, on the north american continent, in the southeastern region of the united states of america. b. georgia is located in the northern and western hemispheres, on the north american continent, in the southeastern region of the united states of america. c. georgia is located in the southern and western hemispheres, on the north american continent, in the southwestern region of the united states of america. d. georgia is located in the northern and western hemispheres, on the north american continent, in the southwestern region of the united states of america.
The correct answer is A. because Georgia is located in the southeastern region of the United States of America, which is in the northern and eastern hemispheres of the north American continent.
Georgia is located in the northern and eastern hemispheres of the world, on the North American continent, in the southeastern region of America. Georgia is a diverse and vibrant state, with a rich history, stunning landscapes, and a vibrant culture. It’s known for its lush forests, dramatic mountain ranges, and majestic waterfalls. Georgia boasts a wide range of attractions, from historic sites and world-class museums to bustling cities and sprawling beaches. It’s also home to a diverse range of cultures, with a variety of ethnicities and languages represented in its population.
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a sizable quantity of soil is washed down the mississippi river and deposited in the gulf of mexico each year. what effect does this tend to have on the length of a day? select all that apply
This soil deposition has no effect on the length of a day.
(Option A) No effect(Option C) It has no effect on the length of a dayEffects of Soil Deposition on the Length of a Day
The yearly soil deposition into the Gulf of Mexico from the Mississippi River does not affect the length of a day in any way. This is because the amount of soil that is deposited is not significant enough to have any impact on the rotational speed of the Earth, which is what determines the length of a day. The rotational speed is determined by the gravitational forces that exist between the moon and Earth, and this is far too powerful to be influenced by such a small amount of soil.
Here's the full task:
A sizable quantity of soil is washed down the Mississippi River and deposited in the Gulf of Mexico each year. What effect does this tend to have on the length of a day?
Select all that apply:
A. No effectB. It decreases the length of a dayC. It has no effect on the length of a dayD. It causes the day to become longer in the winter and shorter in the summerLearn more about soil deposition: https://brainly.com/question/14107874
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what is the circumference of nearth? hint: apply the technique used by eratosthenes to measure earth's circumference.
The circumference of the Earth can be measured using the same technique used by Eratosthenes.
Measuring the Circumference of the Earth Using Eratosthenes' TechniqueThis technique involves measuring the angle of the sun's rays at two different locations that are a known distance apart. Knowing the distance between the two locations and the angle of the sun's rays, the circumference of the Earth can be calculated. The circumference of the Earth is approximately 40,075 km.
This technique, known as the Eratosthenes method, was first used by the ancient Greek mathematician Eratosthenes in the 3rd century BC. He used this technique to accurately measure the circumference of the Earth without leaving his home. He measured the angle of the sun's rays at two different locations that were 500 km apart and used the distance and angle measurements to calculate the circumference of the Earth.
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