The geologic timescale is a system of chronological dating that classifies Earth's history into different time intervals on significant geological events
The four main subdivisions of the geologic timescale, from most recent to oldest, are:A. Cenozoic: This is the most recent subdivision, spanning from 66 million years ago to the present day. It is characterized by the rise of mammals, birds, and flowering plants, as well as the evolution of modern humans.B. Mesozoic: This subdivision spans from 252 to 66 million years ago and is known as the "Age of Reptiles." It includes the famous dinosaurs, as well as the emergence of birds, flowering plants, and the first mammals.C. Paleozoic: This subdivision spans from 541 to 252 million years ago and is known as the "Age of Invertebrates." It includes the rise of complex life forms such as fish, amphibians, reptiles, and insects.D. Precambrian: This is the oldest subdivision, spanning from the formation of the Earth (4.6 billion years ago) to 541 million years ago. It includes the earliest known forms of life, such as bacteria and algae, and the evolution of simple multicellular organisms.
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subduction zones occur a what type of plate boundary?
Answer:
Convergent Plate Boundaries
Explanation:
Subduction zones occur at a convergent plate boundary.
At a convergent plate boundary, two tectonic plates move towards each other and collide. One of the plates is forced beneath the other and sinks into the mantle in a process called subduction. The boundary between the two plates is called a subduction zone, and it is characterized by geological features such as earthquakes, volcanic activity, and mountain building. This type of boundary is found at the edges of the Earth's tectonic plates and is responsible for much of the Earth's tectonic and volcanic activity.
what are the economic uses of three common nonsilicate minerals? Halite is used for common salt, gypsum is used in plaster, and graphite is used as pencil lead.
Hhalite, gypsum, and graphite have various economic uses due to their unique properties.
Halite, or common salt, is used extensively in the food industry as a seasoning, as well as in the production of chlorine, caustic soda, and other chemicals. Gypsum, on the other hand, is used primarily in the construction industry as a key component of plaster, wallboard, and cement.
Finally, graphite is an excellent conductor of electricity and is used in the production of batteries, fuel cells, and other energy storage systems. It is also widely used as a lubricant and in the production of pencil lead.
The economic significance of these minerals lies in their abundance, accessibility, and unique properties, which make them essential to a wide range of industrial and commercial applications.
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what word describes the seasons at the north and south poles?
The word that describes the seasons at the northandsouthpoles is "polar seasons" or "arctic/antarctic seasons".
Polar seasons refer to the distinct patterns of weather and daylight at the Earth's north and south poles.These regions experience extreme seasonal changes, with long periods of darkness in winter and constant daylight in summer.The polar seasons are determined by the Earth's axial tilt and its orbit around the sun.During the winter solstice, which occurs around December 21, the pole that is tilted away from the sun experiences 24 hours of darkness.Conversely, during the summer solstice, which occurs around June 21, the pole that is tilted towards the sun experiences 24 hours of daylight.The transitional seasons of spring and autumn are relatively short and unpredictable at the poles.During the polar winter, temperatures can plummet to as low as -60 degrees Celsius (-76 degrees Fahrenheit).The extreme cold and darkness can make it challenging for humans and animals to survive in polar regions.In contrast, during the polar summer, temperatures can rise above freezing, and the sun never sets.
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black coloration in sedimentary rocks generally implies what character of the sedimentary environment?
quiz calvin is doing some research on climate change. he finds the following book at his local library: hansen, emily, phd. our world is warming up. new york, bantam books, 2019. how can he tell that this is a credible source? select two answers.
The evidence was simply disregarded by the supporters. The truth is that the world was already warming and cooling before greenhouse gases could have had a role.
What is an illustration of a counterclaim?Examples of counterclaims include: After a bank sues a customer for an outstanding debt, the consumer files a counterclaim (return lawsuit) against the bank alleging fraud in obtaining the debt. In a single litigation, the court will adjudicate the various claims (unless the claims are severed).
What does a counterclaim in an argumentative text 1 point mean?The argument (or one of the arguments) that contradicts your thesis statement is known as a counterclaim. The reverse of an argument, or an opposing argument, is called a counterclaim.
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Which North African ethnic group continues to maintain many of its nomadic and semi-nomadic cultural traditions?
A. Egyptians
B. Libyans
C. Moroccans
D. Berbers
The Berbers are an ethnic group in North Africa that still practises a lot of its nomadic and semi-nomadic cultural customs.
Native to North Africa, the Berbers are mostly found in the countries of Morocco, Algeria, Tunisia, Libya, and Mauritania. Pastoralism, transhumance, and trading across the Sahara are just a few of the nomadic and semi-nomadic practises that the Berber people have practised for a very long time. While some Berbers have migrated to cities, the majority of them still remain in rural areas and continue to lead their traditional lifestyles.
Berbers, option D, is the appropriate response as a result.
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what is the movement of population from rural areas to cities called
Answer:
Urbanization
Explanation:
Kayla has 5 rolls of green ribbon. Each roll has 4 meters of green ribbon. She has 6 rolls of blue ribbon. Each roll has 3 meters of blue ribbon
Kayla has a total of 20 meters of green ribbon and 18 meters of blue ribbon.
Kayla is a ribbon enthusiast and has a collection of different colored ribbons.Among her collection, she has 5 rolls of green ribbon.Each roll of green ribbon is 4 meters in length.The total length of green ribbon that she has is 5 rolls x 4 meters per roll = 20 meters.Kayla also has 6 rolls of blue ribbon.Each roll of blue ribbon is 3 meters in length.The total length of blue ribbon that she has is 6 rolls x 3 meters per roll = 18 meters.Kayla now has a total of 20 meters of green ribbon and 18 meters of blue ribbon.She can use the ribbons for various crafts and decoration projects.The green ribbon can be used to add a pop of color to her projects.The blue ribbon can be used to create a calm and peaceful atmosphere.With both the green and blue ribbon, Kayla can create a variety of different moods and styles.Kayla is happy with the amount of ribbon she has and is excited to use it in her future projects.She is always on the lookout for new ribbons to add to her collection.With her collection of green and blue ribbon, Kayla is ready to unleash her creativity.
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Aside from color, how are light silicates and dark silicates different, and why? O. Light silicates have a higher specific gravity because they lack iron and magnesium, whereas dark silicates have a lower specific gravity due to their high iron and magnesium content. O Light silicates have a higher specific gravity Due to their high iron and magnesium content, whereas dark silicates have a lower specific gravity because they lack iron and magnesium. O Light silicates have a higher specific gravity because they have high iron content; dark silicates have a lower specific gravity due to their magnesium content. O Light silicates have a lower specific gravity because they lack iron and magnesium; dark silicates have a higher specific gravity because they have high iron and magnesium content. O Light silicates have a lower specific gravity because they have high iron and magnesium content, whereas dark silicates have a higher specific gravity because they lack iron and magnesium.
Light silicates and dark silicates are different because A) Light silicates have a lower specific gravity because they lack iron and magnesium, whereas dark silicates have a higher specific gravity because they have high iron and magnesium content.
Silicates are minerals composed of silicon and oxygen, along with other elements like iron, magnesium, and aluminum. Light silicates are typically made of aluminum, potassium, sodium, and calcium, while dark silicates contain iron and magnesium.
The difference in composition leads to differences in specific gravity, which is a measure of the density of a mineral compared to the density of water.
Light silicates have a lower specific gravity because they lack heavy elements like iron and magnesium, while dark silicates have a higher specific gravity because of their high iron and magnesium content.
This difference in density can be used to identify and classify different types of silicates, which can be useful in mineralogy and geology.
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an astronaut on a distant planet wants to determine
The acceleration (magnitude and direction) due to gravity on this planet if the astronaut throws a rock straight up with a velocity of +15 m/s and measures a time of 20.0 s before the rock returns to his hand are 1.5 m/s².
The y аxis is meаsured upwаrd from the position of the hаnd. We know the initiаl velocity of the rock, [tex]v_{0}[/tex] = +15.0 m/s but we don’t know the vаlue of the аccelerаtion, аy. We do know thаt it will be а negаtive number, becаuse objects fаll down on this plаnet too. We know thаt аt t = 0.0 s y is 0.0 m (of course) but we аlso know thаt аt t = 20.0 s, y is equаl to 0.0 s.
0.0 = (15.0 m/s) (20.0 s) + [tex]\frac{1}{2}[/tex]a(20.0 s)²
from which we cаn find а. Some аlgebrа gives us:
[tex]\frac{1}{2}[/tex]a(20.0 s)² = -300m
a = -[tex]\frac{2(300m)x}{(20.00s)^{2} }[/tex]
a = -1.50m/s²
The mаgnitude of the аccelerаtion due to grаvity on the plаnet is 1.50 m/s² аnd from the minus sign we know thаt the direction of the аccelerаtion is downwаrd.
Your question is incomplete, but most probably your full answer can be seen in the Attachment.
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what will happen to the freshwater fish if you place it in sea water and why?
Its cells wither and die If freshwater fish are kept in seawater, they will be exposed to highly concentrated water,so water tends to run out of the fish.
If freshwater fish are kept in seawater,they will be exposed to highly concentrated water, so water tends to run out of the fish. The fish will dehydrate and may die.This is due to osmosis.Water always goes from a dilute solution to a concentrated solution.On the other hand, freshwater fish cannot survive in the ocean or saltwater because seawater is too salty for them.The water inside their bodies would leak out of their cells and they would die of dehydration.Both processes are called osmosis. If a marine fish is placed in a freshwater aquarium, the fish will not be able to survive because the fish are adapted to seawater,the body of the fish is hypertonic,but when the water is moved into an aquarium it becomes hypotonic.They are unable to regulate the metabolic process in the modified environment and die.
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what object causes the earth’s tides?
Answer:
Both the Moon and Sun, but the Moon's effect is about twice as big.
Explanation:
Answer:
moon
Explanation:
Gravity is one major force that creates tides.
moon
Write a statement about Fall Lines that shows the connection between
movement, region, human-environment interaction, location, and/or place. Be sure to include specifics about the fall line, gristmill, and their
relationship with one another.
Waterfalls and rapids provided a source of energy that was harnessed by early settlers to establish gristmills, which played a key role in shaping the human-environment interaction and location of many communities.
The Fall Line Gristmill Interaction And How they were harnessedThe Fall Line, which marks the boundary between the Atlantic Coastal Plain and the Piedmont Plateau, is a significant geographical feature that has shaped the development of many regions in the United States. At this location, waterfalls and rapids provided a source of energy that was harnessed by early settlers to establish gristmills, which played a key role in shaping the human-environment interaction and location of many communities.
These gristmills, which were essential for grinding grain into flour, were often located near the fall line to take advantage of the energy generated by the falling water. This, in turn, attracted settlers to the area, leading to the growth and development of towns and cities along the fall line.
As such, the fall line and gristmills serve as powerful examples of the interplay between movement, region, human-environment interaction, location, and place in shaping the character and development of a region.
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Which action is part of a scientific investigation?
A. Interview scientists from many areas of study.
B. Gather opinions about which natural events to observe.
C. Record useful data gathered through observation.
D. Analyze the total cost of conducting an experiment.
C. Record useful data gathered through observation.
Need help ASAP!!
Describe what happens at each number in the diagram so to explain a convection current.
Convection is the movement of a fluid that transfers heat from one location to another.
What is the importance of convection currents?Convection also contributes to the movement of deep ocean waters and the formation of oceanic currents. Inside the Earth, mantle convection is assumed to drive the movement of the overlying crustal plates, resulting in earthquakes and volcanic eruptions.
Thermal energy is carried by the flowing fluid. Because convection involves particle movement, it can only occur within fluids such as gases and liquids. A solid's particles are set in place and cannot move. As a result, convection cannot occur in a solid.
A convection current is the movement of warm and cold fluid caused by convection. When cold fluid is warmed by a heat source, a convection current occurs. The cold fluid warms and rises. Because warm fluid is less thick, it rises.
The heated fluid cools as it flows away from the source of heat. It tends to stretch out and then sink. Cool fluid sinks because it is denser. It cools as it sinks.
Cold fluid travels to replace the heated fluid that migrated in the first place. It is warmed by the heat source, and the current resumes.
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Li has 3 more dimes than nickels. The value of all of his coins is $3.00. Which system of equations can be used to find the number of nickels, n, and dimes, d, that Li has?
Answer:
Li has 12 nickels and 12 + 3 = 15 dimes.
Explanation:
Let's call the number of nickels Li has "n". Then, the number of dimes he has would be "n + 3". We know the total value of all of Li's coins is $3.00. Nickels are worth $0.05 each, and dimes are worth $0.10 each, so we can write a system of two equations to represent this information:
n * $0.05 + (n + 3) * $0.10 = $3.00
Expanding the right side:
n * $0.05 + n * $0.10 + 3 * $0.10 = $3.00
Combining like terms:
1.5n + $0.30 = $3.00
Subtracting $0.30 from both sides:
1.5n = $2.70
Dividing both sides by 1.5:
n = $1.80 / 1.5 = 12
Eastern Europe has a harsher climate because it is farther fromA. North Atlantic Drift
B. Mediterranean
C. The Danube
D. The Atlantic Ocean
Eastern Europe has a harsher climate because it is farther from The Atlantic Ocean (D)
How does The Atlantic Ocean affect the climate?The ocean currents function in a way that is similar to that of a conveyor belt, moving cold water from the tropics to the poles and warm water from the poles back to the equator. Warm water and precipitation go in the other direction. As a result, ocean currents help to manage the global temperature by helping to compensate for the uneven distribution of solar energy that reaches the surface of the earth.
The ocean acts as a temperature regulator and is a primary driver of the weather, influencing such phenomena as rainfall, drought, and flooding. According to estimates, ocean waters are responsible for the circulation of around 83% of the world's total carbon cycle. Because of this, the oceans are also the world's largest carbon store.
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what was the main selective pressure behind the evolution of different anolis lizard species in the caribbean?
Different species evolved in response to the selective pressures created by the islands' specific ecological niches.
Anolis carolinensis, also known as the green anole (US: /no.li/ (listen)) (among other names below), is a tree-dwelling anole lizard native to the southeastern United States and introduced to Pacific and Caribbean islands. The green anole is a small to medium-sized lizard with a trunk-crown ecomorph that can change its color from brown to green.
Other names for the Carolina anole include Carolina green anole, American anole, North American green anole, and red-throated anole. Due to its color-changing ability, it is commonly referred to as chameleon in the southeastern United States and sometimes as the American chameleon (typically in the pet trade); however, it is not a true chameleon.
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when you look at the sky on a dark night and see stars of different colors, which are the hottest?
Blue stars are the hottest
Our living style is determined by climate.Justify with examples.
Natural gas is considered an environmental friendly fuel. Suggest and explain
an three ways to make it
popular.
Answer:
Explanation:
Natural gas is considered an environmentally friendly fuel due to its lower carbon emissions compared to other fossil fuels like coal and oil. To make natural gas more popular and widely used, the following three strategies can be implemented:
Increase Awareness: One of the key ways to make natural gas more popular is to increase awareness about its environmental benefits. This can be done through public education campaigns and outreach programs that highlight the positive impact of natural gas on the environment.
Investment in Infrastructure: Another way to make natural gas more popular is to invest in the necessary infrastructure to support its distribution and use. This includes building pipelines, natural gas refueling stations, and storage facilities to make it easier and more convenient for people to use natural gas.
Government Incentives: Governments can also play a key role in promoting the use of natural gas by offering incentives to individuals and companies that switch to natural gas. This can include tax credits, subsidies, and other financial incentives that make it more cost-effective to use natural gas over other fossil fuels.
In Kenya, the literacy rate for males is 90.6% while the rate for girls is 79.7%. In Sudan, 71.8% of males are considered literate as opposed to 50.5%
of the female population.
Which statement BEST describes what is causing the difference in literacy rates for males and females?
The statement that BEST describes what is causing the difference in literacy rates for males and females is option B. Cultural norms and values place little emphasis on education for females in the two nations.
What is a cultural norm and value?A cultural norm is a behavior or practice that is considered typical or expected within a particular society or group. A cultural value, on the other hand, is a belief or principle that a society or group considers important and worthy of respect. Cultural norms and values are closely related, as values often underlie and shape the norms that govern behavior in a given culture.
Therefore, it is the fact that Cultural norms and values place little emphasis on education for females in the two nations.
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The complete question goes thus:
In Kenya, the literacy rate for males is 90.6% while the rate for girls is 79.7%. In Sudan, 71.8% of males are considered literate as opposed to 50.5% of the female population.
Which statement BEST describes what is causing the difference in literacy rates for males and females?
A) Female students are less able to afford tuition to attend school.
B) Cultural norms and values place little emphasis on education for females in the two nations.
C) Female students are only required to attend school until age 7, while males attend until age 10.
D) Male students have greater literacy rates because of mandatory military programs in the schools.
the solid portion of earth is made up of oxygen and?
The solid portion of the Earth is primarily made up of silicates, These silicates make up the Earth'scrust, mantle, and core.
The crust is the Earth's outermost layer and is composed of various types of rock, including igneous, sedimentary, and metamorphic rocks. This layer is relatively thin compared to the other layers of the Earth and makes up about 1% of the Earth's total volume.The mantle is the layer beneath the Earth'scrust and is composed mainly of silicate minerals, including olivine and pyroxene. The mantle makes up about 84% of the Earth's total volume.The core is the center of the Earth and is composed mainly of iron and nickel. The core is divided into two parts: the outer core, which is liquid, and the inner core, which is solid. The inner core makes up about 1/3 of the Earth's total volume.In addition to silicates and metal elements, the Earth's solid portion also contains smaller amounts of other elements, such as calcium, sodium, and potassium. These elements are important components of the Earth's minerals and rocks and play a role in the Earth's geology and geochemistry.
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What is the piece of infrastructure that connects the red sea to the mediterranean sea?
The Suez Canal, constructed in the 1860s, links the Red Sea to the Mediterranean Sea.
If the Suez Canal hadn't been constructed in 1869, the Red Sea and Mediterranean Sea would not be linked.
Since that time, travel between Europe, Asia, and the Middle East has been simpler. It has developed into a crucial commercial route between these continents, and if it is blocked, terrible things will happen.
Ships had to travel past Africa's southernmost points to reach the Mediterranean before the Suez Canal was completed.
But now you simply have to travel through the Canal, which takes a little more than a half day to complete.
But because of the Suez Canal, more invasive fauna is entering the Mediterranean from the Red Sea.
Overall, neither of these Seas had a natural connection.
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Magmas have a variety of chemical compositions because of all of the following EXCEPT
A. the rocks that melt to make magma are composed of many minerals, not all of which melt under the same conditions.
B. the magmas' heat can melt rock from the walls of the magma chamber.
C. they come from a variety of source rocks.
D. different magmas formed in different locations are isolated and don't mix.
Magmas have a variety of chemical compositions because of all of the following EXCEPT "different magmas formed in different locations are isolated and don't mix".
The other options provided are all potential reasons for the variety of chemical compositions of magmas. The rocks that melt to form magma are made up of different minerals that do not all melt under the same conditions, resulting in a range of chemical compositions. The heat from magma can also melt rocks from the walls of the magma chamber, contributing to the composition of the magma. Additionally, magmas can come from a variety of source rocks, each with their own chemical compositions, which can affect the overall composition of the resulting magma.
Magmas are molten materials that are formed beneath the Earth's surface, typically in the mantle or lower crust. They can have a wide range of chemical compositions, depending on a number of factors.
One important factor is the composition of the rocks that melt to make the magma. Rocks are made up of various minerals, and not all of these minerals melt at the same temperature and pressure conditions. As a result, when rocks are heated up, some minerals may melt before others, leading to a range of chemical compositions in the resulting magma.
Another factor is the heat from the magma itself. As magma rises towards the surface, it can heat up and melt the surrounding rocks, which can also contribute to the chemical composition of the magma.
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Why does climate change pose a threat to human health?
Question 23 options:
It is causing more extreme weather events--including cyclones, typhoons, and hurricanes.
Natural disasters such as drought and flooding are more destructive than ever before
Sea levels are rising which results in destruction to coastal habitats
All of the above
Answer:All of the Above
Explanation:
Climate change is said to cause all three of these, therefore the answer is all of the above
why are there high ozone concentrations over the north atlantic ocean duringthe summer, despite the lack of large noand voc emissions from the ocean
The high ozone concentrations over the North Atlantic Ocean during the summer are due to a combination of natural factor such as high temperature, and human factors such as transportation which is more frequently happens in the summer.
One of the main natural factors is the high levels of sunlight and temperature during the summer, which can cause ozone to form through a series of chemical reactions.
Additionally, air masses containing ozone from other regions can be transported over the North Atlantic Ocean by winds. Human factors, such as emissions from sources located far from the ocean, can also contribute to the high ozone concentrations over the North Atlantic Ocean during the summer.
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copernicus said that the rotation of the earth on its axis caused the
(A) phases of the Moon.
(B) retrograde motion of the planets.
(C) eclipses of the Moon
(D) motion of the Sun along the ecliptic.
(E) daily motions in the heavens.
Copernicus said that the rotation of the earth on its axis caused the (A) phases of the Moon.
Copernicus proposed the heliocentric model of the solar system, which placed the Sun at the center and the planets, including the Earth, revolving around it.
He argued that the phases of the Moon, which are the different shapes of the Moon as seen from Earth, were caused by the relative positions of the Sun, Earth, and Moon. As the Moon orbits around the Earth, the amount of sunlight it reflects changes, leading to different phases.
Copernicus also observed that the retrograde motion of the planets could be explained by their relative positions and the speed of their orbits. His work was a significant contribution to the scientific revolution, and it challenged the geocentric model of the universe that was widely accepted at the time.
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the idealized conditions necessary for a population to achieve rmax include
In ecology, "rmax" or maximum intrinsic rate of population growth, refers to the theoretical maximum rate at which a population can increase under ideal conditions.
The idealized conditions necessary for a population to achieve rmax are:
1. Unlimited Resources: The population must have access to a constant and unlimited supply of food, water, and other essential resources required for their survival and reproduction.
2. No Predation: The population must not face any predation, disease, or parasitism. This means that the individuals in the population are not being hunted or killed by any other organisms.
3. Optimal Environmental Conditions: The population must be living in an environment that is free from any adverse or stressful conditions such as extreme temperatures, weather events, or natural disasters.
4. No Competition: The population must not face any competition for resources from other organisms in the same ecological niche.
5. High Reproductive Output: The individuals in the population must have a high reproductive output and produce many offspring in each generation, which can grow and reproduce quickly.
In reality, these conditions are rarely met, and populations typically operate under conditions that are less than ideal. Thus, rmax is usually only attainable under artificial laboratory conditions, and in the natural world, it represents a theoretical limit that populations cannot realistically achieve.
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Rocks around the world contain evidence that seas have advanced and retreated and ______ have been uplifted and eroded
Rising mountains and eroded rocks all over the world contain the seas that have advanced and receded.
Shale,and limestone are examples of sedimentary rocks that likely contain fossils. As the layers of sediment build up on top of each other, they create a physical timeline.The oldest layers,along with the organisms that fossilized as they formed,are the deepest.The youngest layers are at the top. We study the history of the Earth by studying the record of past events that is preserved in rocks.The rock layers are the pages of our history book.The Earth's surface is sediment formed from older rock particles that have been broken down by water or wind.They are important to Earth's history.Sedimentary rocks contain features that allow us to interpret ancient depositional environments,including the evolution of organisms and the environments in which they lived in,how the climate has changed throughout the history of the Earth,where and when the faults were active.
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