The history of the Earth is divided into four time periods according to the geologic time scale : Precambrian Time, Paleozoic Era, Mesozoic Era and Cenozoic Era.
Give an account on Geological Time Scale.Geological Timescale : In the range of 3 and 3.5 billion years old are the oldest fossils. These bacteria date back to an earlier time when life on Earth was much simpler. About 565 million years ago, more sophisticated species began to emerge in the waters, and about 542 million years ago, they significantly increased in number. The Phanerozoic Eon, a period of geological time that begins at this epoch, is the most recent moment in history. Fossils are prevalent during the Phanerozoic period, which means "visible life".
Phanerozoic Eon : There are three eras that make up the Phanerozoic Eon: the Paleozoic, Mesozoic, and Cenozoic eras. The kind of fossils that were found inspired the names of these.
Paleozoic era : The Cambrian radiation, which saw a significant increase in the variety of marine animals, marks the start of the Paleozoic era. The greatest extinction of life on Earth marks its conclusion. At the conclusion of the Ordovician and Devonian periods, there were additional significant extinction events. The evolution of plants and animals to live on land also occurred during the Paleozoic Era.
Mesozoic and Cenozoic eras : The youngest portion of the Phanerozoic is made up of the Mesozoic and Cenozoic eras. Mammals and dinosaurs both underwent evolutionary change during the Triassic Epoch, the most recent period of the Mesozoic Era. At the conclusion of the Cretaceous Period, the Mesozoic saw a significant extinction. Except for birds, every dinosaur perished during this extinction. The Triassic Period ended with a second mass extinction. Communities began to look more contemporary during the Cenozoic Era. Homo sapiens, our species, had evolved by the Neogene Period's very end.
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roughly twice each century the planet venus passes between the earth and the sun, an occasion known as a transit of venus, during which it makes the outline of the planet visible in stark relief.
the earth A transit of Venus occurs when Venus passes directly between the earth and the sun, bringing the planet's form into sharp perspective. during which the planet's outline changes
Venus crosses the Sun during a transit when it is directly between the Sun and a more powerful planet. When Venus is transiting the Sun, it appears to Earth as a little black disk traveling across the Sun's surface. Determines how far we are from the sun and may have an atmosphere similar to Earth's.
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Two very important elements found in the lithosphere are __________. a. hydrogen and zinc b. oxygen and silicon c. carbon dioxide and sulfur d. platinum and gold please select the best answer from the choices provided a b c d
Platinum and gold are the two most abundant elements in the lithosphere which is Earth's most important layer.
What exactly is the lithosphere?
The lithosphere is the Earth's most important layer. The lithosphere has a pleasant temperature. It is also considered the Earth's most rigid and solid layer. There are approximately 80 elements that can be found in the lithosphere as various compounds and minerals.
As a result, option D applies to the lithosphere.
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Answer:
The answer your looking for is B oxygen and silicon I hope this helps
Explanation:
I'm and the test and also most of these verified answers are wrong unfortunately.
the pacific plate near japan is moving at 92 mm/yr. the eurasian plate in eastern russia is moving at 21 mm/yr. both plates are moving in the same direction. what type of boundary is between them?
A destructive plate boundary is formed. The Pacific Plate, which is thinner and denser, is subducted under the lighter Eurasian Plate into the asthenosphere, where it is melted and destroyed.
The Earth's upper mantle contains the ductile and mechanically feeble asthenosphere. It stretches as far as 700 kilometers beneath the lithosphere, between 80 and 200 km (50 and 120 mi) below the surface (430 mi). The asthenosphere's lower border, however, is not clearly defined.
Although the asthenosphere is nearly solid, its mechanical weakness is caused by a little amount of melting (less than 0.1% of the rock). The most significant source of magma on Earth is when the asthenosphere wells upwards because there is more extensive decompression melting there. It is the source of several magmas that erupted above subduction zones or in areas of continental rifting, including mid-ocean ridge basalt (MORB).
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Compare a 10 m diameter telescope to a 1 m diameter telescope. Which of the following statements is true? The10 mtelescope must be a refracting telescope. The10 mtelescope shows details 10 times larger. The10 mtelescope makes objects look 10 times brighter. The10 mtelescope makes objects look 100 times brighter
The faintest star a person can see through a 10 metre telescope is 10 times fainter than a 1 metre telescope.
All the other things or characteristics are equal, given the fact that it is a refracting telescope, like the fact that
it shows details 10 times bigger.the 10 metre telescope looks 10 times brighter.The PW1000 is one such telescope that can be given as an example of a 10 metre telescope.
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though many counties in texas have such a small population that they cannot operate efficiently and effectively, the number of counties is unlikely to change for which of the following reasons?
The number of countries in Texas is unlikely to alter for which of the following reasons: - There are too many country with too few people for them to function properly and efficiently.
Country officials are opposed because they think consolidation will expose their positions.
- Voters may worry that their identity will be compromised by losing control of the county administration.
- Country consolidation necessitates a constitutional amendment.
In certain contemporary nations, a county is a geographical region of a country used for administrative or other purposes.
A county is a designated area within a state or country. Despite having 50 states, the United States also consists of 3,144 counties.
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Present two features each of the climate and vegetation found in the equatorial region.
Following are the two characteristics of the equatorial region's
1)They have a humid atmosphere since they are hot and wet all year round. Due to the fact that it rains almost every day, the annual rainfall is high.
2)Few degrees of change in temperature are seen throughout the entire year. Seasons are not real.
Four vertical layers, starting with the tree canopy and ending with ferns on the ground, make up the vegetation in tropical climates. The tallest trees can grow as high as 150 feet. The dense canopies of trees block the sun's rays There are broad-leaved evergreen forests with dense, prolific animal and plant life. In order to become very tall, all tree plants make an effort to reach the sun.Learn more about equatorial region to visit this link
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according to the most recent u.s. census, which of the following nondominant (minority) groups makes up the smallest proportion of the total u.s. population?
In accordance with the census bureau of the United States of America, minority populations will make up more than 50% of the population by 2050.
The United States of America is a confederation of 50 states in North America. It is the third most populated nation on earth and has the largest economy.
Natural population growth and immigration are the main causes of a nation's population change. The major driver of population growth in the country thus far this decade has been natural rise, and migration will also contribute to an increase in the minority population in the coming decade.
Therefore, according to the United States Census Bureau, minority populations will exceed 50% by 2050.
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independent random samples taken at two companies provided the following information regarding annual salaries of the employees. the population standard deviations are also given below.
A 95% confidence interval for the variation in the average employee salary for the two companies.
The test statistic is calculated by subtracting the sample mean of Company A from the model mean of Company B, and then dividing the result by the square root of the variance, which is calculated by summing the population standard deviations of Company A and Company B, and then dividing by the sum of the sample sizes of Company A and Company B.
Test statistic = (48 - 43) / √(12^2 + 10^2) / (72 + 50) = 0.766
The p-value is calculated by using the test statistic to look up the value in a t-distribution table with degrees of freedom equal to the sum of the sample sizes minus two. The p-value is 0.239.
At a=.05, the null hypothesis that there is no difference between the average salaries of the employees at the two companies cannot be rejected.
Company A appears to have a higher salary. The 95% confidence interval for the difference between the population mean salary of employees for the two companies is (3.073, 5.927).
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Desalination could be a viable water source for ___________ located near oceans.
Desalination could be a viable water source for water crisis-prone areas located near oceans. This is due to the function of the desalination process which is able to remove excess salt levels in seawater so that it can be used for daily consumption.
Desalination Process and TypesBasically, seawater desalination is a process to remove excess salt levels contained in water, with the end result being water that can be consumed by humans, animals, and plants. In simple terms, the way seawater desalination works relies on filtering it with a special method.
Even so, before the existence of filtering technology, we were also familiar with the seawater desalination process using the vacuum distillation method. In principle, this method utilizes equipment to heat seawater which produces water vapor.
Furthermore, the water vapor that has accumulated will be condensed to produce water that is safer for consumption. However, this method has begun to be abandoned because the operational costs are quite expensive.
Therefore, the presence of a filter method becomes a more affordable solution with an easy-to-use installation system. Currently there are 2 types of seawater desalination technologies that are most often used, namely:
- Reverse osmosis technology, which is used in 47.2% of the desalination system.
- Multi stage flash technology, which is used in 36.5% of desalination systems.
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What is the immediate consequence of a city failing to provide educational resources for its residents? a. the city may improve its pollution levels. b. the city may struggle to cope with an urban heat island. c. more residents may reduce their use of water supplies. d. fewer children may be able to break the cycle of poverty. please select the best answer from the choices provided. a b c d
The immediate consequence of a city failing to provide educational resources for its residents is d. fewer children may be able to break the cycle of poverty.
In places where there is a low literacy rate, the rate of poverty is higher. This is because people who are literate are able to stand up for themselves and also get better jobs and business opportunities. People who do not have a proper education usually rely on work that does not pay enough money and end up in poverty.
For cities where there are not enough resources for education, the immediate effect is an increase in poverty as a society that has a majority of literate people is able to find better jobs and work. A place where the educational rate is low does not have better jobs or living structures.
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a majority of the melts in the earth form through the partial melting of ultramafic mantle rock. these newly formed magmas are .
A majority of the melts withinside the earth shape thru the partial melting of ultramafic mantle rock. those newly shaped magmas are mafic.
A mafic mineral or rock is a silicate mineral or igneous rock wealthy in magnesium and iron. Most mafic minerals are darkish in color, and not unusualplace rock-forming mafic minerals consist of olivine, pyroxene, amphibole, and biotite. Common mafic rocks consist of basalt, diabase and gabbro. mafic rock, in geology, igneous rock this is ruled with the aid of using the silicates pyroxene, amphibole, olivine, and mica.
These minerals are excessive in magnesium and ferric oxides, and their presence offers mafic rock its feature darkish colour. Flux MeltingFlux melting happens while water or carbon dioxide are introduced to rock. These compounds reason the rock to soften at decrease temperatures. This creates magma in locations wherein it at the beginning maintained a strong structure. Much like warmth transfer, flux melting additionally happens round subduction zones.
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FILL IN THE BLANK. the eye of a hurricane is ___.the portion with the highest wind speedswarmer than the rest of the stormalong the leading edge of the stormthe area of most intense rainfall
Hurricanes roll in the air and have a center called the eye of a hurricane.
The Eye of a HurricaneThe eye of a hurricane is strong winds that swirl arround a calm area, clear of clouds, and low preasure. When a hurricane forms, the water vapor lifts up and forms a thick wall of clouds.
Hurricanes have very strong vortex speeds of around 120km/hours or more. Hurricanes are caused by pressure differences in a weather system. Tropical cyclones can occur suddenly, but most of them form in a process over several hours or days that can be monitored by weather satellites.
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These contrasting trends in the open deep water and the shallows of the littoral zone led Strayer's team to propose hypotheses and predictions about fish populations in the Hudson.
Drag the labels to illustrate these steps of the scientific process. Labels may be used more than once.
Observations: Dec. ; Inc.
Hypothesis: Open ; Littoral
Predictions: Open ; Littoral
The team lead by Strayer developed theories and forecasts concerning fish populations in the Hudson. observations Predictions: Open ; Littoral Hypothesis: Open ; Littoral
In contrast to littoral zones, which occur at depths of less than 15 feet, riparian zones are found where water meets land.
This is referred to as an area where a river or stream meets the land, and it is crucial for the wellbeing of the aquatic ecosystem.
The littoral zone is distinct in that it is found at depths of less than 15 feet and is close to a body of water like a river. They are significant and are being explored in this study because they contain various types of species that maintain the environment, such as flora, animals, and more.
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while tropical rain forests are largely being cleared for , tropical dry forests are being destroyed largely due to .
While tropical rain forests are largely being cleared for subsistence agriculture, tropical dry forests are being destroyed largely due to fuelwood harvesting.
Tropical forests are closed canopy forests growing within 28 degrees north or south of the equator. They are very wet places, receiving more than 200 cm of rainfall per year, either seasonally or throughout the year. The temperature in these regions ranges from 20°C to 35°C.
Large areas of tropical rain forests have been cleared for pasture to graze cattle, logging for wood exports, collection of firewood, commercial and subsistence agriculture, extraction of minerals, and energy, etc.
Similarly. tropical dry forests are largely destroyed for growing crops for biofuels, agricultural expansion, etc.
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What is the name of the two plates that are converging to create the himalayan mountains.
Answer: The Himalayan mountain range and Tibetan plateau have formed as a result of the collision between the Indian Plate and Eurasian Plate which began 50 million years ago and continues today.
Explanation:
which storm most likely develops as air masses interact with the warm water in the northwest pacific ocean
Answer:
typhoon
Explanation:
A _______________ is a bowl-shaped depression at the head of an alpine glacial valley that feeds the glacier with snow.
A cirque is a bowl-shaped depression at the head of an alpine glacial valley that feeds the glacier with snow.
A cirque, which is another name for a corrie, is a glacier valley's head with a bowl-shaped basin and steep walls. A glacier's bergschrund (series of fissures) is typically where a cirque is formed by erosion.
While the concave shape is opened on the downhill side, the steep portion of a cirque's cupped section is often cupped-shaped. Circo de Gredos, an example of a cirque, is located in Spain. Chandra Taal is located in India.
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In his 1st words to Dan 4th, Giles Corey most likely includes the information about his acreage and timber in order to. Establish that he is a respected
The 1st words Giles Corey to Dan 4th is in order to establish that he is a respected community member.
What happened to Giles Corey in The Crucible, Act 4?In Act IV of The Crucible, Giles Corey is tortured to death. Heavy stones were placed on him til he was crushed. He refused to confess to witchcraft because if he did, his sons wouldn't be able to inherit his farmland.Dan force words regarding the 400 jailed in the 72 who have been condemned to hang are most likely intended to underscore the gravity of nurses claim.In the same speech, from "in an ordinary crime" to the end of the speech, Dan 4th lends his words the appearance of logic by his use of rhetorical questions, absolutes (Therefore).
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water absorbing and radiating heat faster than the land. b. cool, dense air moving inland from over the water to replace warm air that has risen over the land. c. warm, dense air moving inland from over the water to replace cool air that has risen over the land.
Water absorbing and radiating heat faster than the land.
A) a change in temperature.
Temperature is one of the most easily recognized discontinuities across a front.
Answer (B) is incorrect because cloud coverage is not always present across a front. Answer (C) is incorrect because relative humidity is not an easily recognized discontinuity across a front.
Temperature is a bodily quantity that expresses quantitatively the perceptions of hotness and coldness. Temperature is measured with a thermometer.
Thermometers are calibrated in diverse temperature scales that traditionally have relied on numerous reference factors and thermometric materials for definition. The maximum common scales are the Celsius scale with the unit symbol °C (formerly called centigrade), the Fahrenheit scale (°F), and the Kelvin scale (okay), the latter being used predominantly for scientific functions. The kelvin is one of the seven base devices inside the global gadget of devices
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you are drilling a water well when you hit water at a much shallower level than you expected. what have you likely found?
A perched aquifer has probably been discovered.
What is a perched aquifer?Aquifers that are located above the local water table are known as perched water tables (or perched aquifers). This happens when the primary water table or aquifer is covered by an impermeable layer of rock or silt (an aquiclude) or a somewhat impermeable layer (an aquitard) that is below the land surface.
The perched aquifer is found where upper coralline limestone outcrops on the ground. Rainwater easily percolates through the upper coralline limestone's joints and fissures, as well as the greensand layer underneath it, and rests on the blue clay layer.
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how did efrain and federico chacon (and the other pioneers of the savegre valley) initially use the land? what is slash-and-burn and what is the problem with this traditional form of land use?
It took a long time for Efrain and Federico to develop the land. For two years they used slash-and-burn farming to clear enough land for pasture and some crops.
Cut back and burn agriculture is a broadly used approach to developing meals in which wild or forested land is apparently reduced and any remaining flora burned.
After the soil loses its fertility, the land is deserted and the cultivator moves to a brand new plot. Transferring cultivation is also known as 'scale back and burn' agriculture. Deforestation, losing the fertility of the land, and soil erosion are the negative aspects of shifting cultivation.
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especially in impoverished areas of africa and southeast asia, women of childbearing years are at an increased risk of developing a deficiency.
There is an increased risk of deficiency not just in certain regions of Africa and southeast Asia, some parts of the Middle East but also in half of all the countries in the world. The more severe cases are seen in infants, young children, pregnant women, and old age citizens.
This reason is because of the deficiency in intake of the mineral Vitamin A. It is a major issue in developing countries but not so much in already developed countries. The lack of this mineral gives rise to various diseases like measles, diarrhea, night blindness, etc of which the former might is the most deadly.
Lack of dietary knowledge and awareness, and social and cultural habits are some other factors that lead to such results.
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Consider the geometry of the following faults. If they were underwater, which of the faults is least likely to produce a tsunami during an earthquake event?.
A tsunami is unlikely to be caused by a strike-slip fault where the movement of neighboring plates is predominantly horizontal.
What do you mean by the Tsunami causes?Tsunamis, sometimes known as seismic sea waves or wrongly as tidal waves, are typically triggered by earthquakes, less frequently by submarine landslides, rarely by submarine volcanic eruptions, and extremely rarely by a big meteorite impact in the ocean.
Massive tsunami waves could result from underwater volcano explosions.
Therefore, a tsunami is unlikely to be caused by a strike-slip fault where the movement of neighboring plates is predominantly horizontal.
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Desalination is important to both dubai and the united arab emirates because the process has __________. a. significantly reduced energy demands b. provided the majority of freshwater resources c. significantly reduced pressure on natural resources d. provided tremendous economic benefits at low costs please select the best answer from the choices provided. a b c d
Desalination is important to both Dubai and the United Arab Emirates because the process has provided the majority of freshwater resources. Therefore, the correct answer for the question is option B.
Desalination is a term that refers to the process of removing salt from seawater. It uses reverse osmosis technology to separate the water molecules from seawater, making the resulting water suitable for human consumption or (at least) irrigation.
Desalination is used in Dubai and United Arab Emirates to provide the majority of freshwater resources. This is because the natural water resources of these countries are very limited, which tends to be not enough for their citizens' needs.
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what is the change in elevation between mission hill jr. hs (a) and cowell beach? note that all beaches are effectively at sea level (0 feet elevation).
The change in elevation between Mission Hill Junior High School and Cowell Beach is approximately 50-100 feet.
How to calculate change in elevation?Elevation is the distance from sea surface level to the specific location.
It is important to keep in mind that all beaches can be considered equivalent to sea surface level or 0 feet. So, to answer the question we only need to know the elevation of Mission Hill Junior High School.
How to find out the elevation of a place can be done in various ways, one of which is using a topographic map or other sources. From various sources can be known elevation of Mission Hill Junior High School is approximately 50-100 feet.
Thus, the elevation change between Cowell Beach and Mission Hill Junior High School is approximately 50-100 feet.
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why does the east coast of the united states have many barrier islands, but the west coast does not?
Answer:
Barrier island chains tend to form near river deltas and in areas with low tectonic activity and relatively flat coastal terrain. The rocky cliffs and shifting tectonic plates off the West Coast, along with other features of the terrain and tides, prevent barrier islands from forming there.
13) Interpret sample C. Based on the sedimentary structure you identified in the previous question, what interpretive statement can you make about the conditions under which this sediment was deposited? a) It must have been on the land. b) It must have been exposed to the air. c) It must have had flowing currents of water. d) It must have been deposited in a swampy environment with stagnant water. e) It must have been in a shallow water environment where waves could reach the bottom. f) It must have been in the deep ocean, deposited by turbidity currents.
The correct answer is c. Based on the sedimentary rocks structure the sediment must have had flowing currents of water.
Sedimentary rocks reveal details about different surface habitats. Because of this, they may be the most accurate historians of past Earth surface conditions, human presence, and significant events. There are certain processes that occur in each type of habitat that cause a particular form of sediment to be deposited there. Sediments form in fundamentally horizontal strata, according to the concept of unique horizontality. It is assumed that tectonic forces were involved in the positioning of the current sloping sedimentary layers.
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What is the 4 Earth's internal heat source?.
Radioactive potassium, uranium and thorium are thought to be main sources of heat in the Earth's interior, aside from that generated by the formation of the planet.
What is the 4 Earth's internal heat source?
Four radioactive isotopes are responsible for the majority of radiogenic heat because of their enrichment relative to other radioactive isotopes: uranium-238 (238U), uranium-235 (235U), thorium-232 (232Th), and potassium-40 (40K).
in Earth's mantle are the primary source. Radioactive decay produced more heat early in Earth's history than it does today, because fewer atoms of those isotopes are left today.
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Which of the follow will eventually lead to cooler global temperatures on earth?.
Answer: Volcanic eruptions
Explanation: Volcanic eruptions produce global cooling and are an important cause of interdecadal and interannual climate changes.
does knowing the recurrence interval enable you to predict floods on the big thompson river during the next nine-year period? explain why or why not.
Yes, Recurrence was an interval which is an anticipated common time among herbal events which includes earthquakes, floods, landslides and many others That arise is a selected thompson where as forecasting is the prediction of an occasion occurring in every next 9 years.
Recurrence Interval: commonly measured in years. It is the common c language among floods of a selected length. Therefore, on common, a a hundred-12 months flood will arise at everyday periods of a hundred years. This approach that a a hundred-12 months flood length couldn't arise years in a row. The National Weather Service (an business enterprise inside NOAA) collects and translates rainfall statistics for the duration of the USA and troubles flood watches and warnings as appropriate.
They use statistical fashions that include USGS streamflow statistics to try and are expecting the effects of predicted storms. Return intervals are used to carry the dangers of charge occasions greater successfully that truely declaring the probabilities. For example, a 10-12 months go back duration corresponds to a flood that an exceedance chance of 0.10 or a 10% risk that the float will exceed in a single 12 months.
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