Erosion and Deposition — Unit test Answers
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21
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Which event in Earth’s history most directly allowed life to exist on land?
A
Earth’s temperatures increased, causing widespread evaporation.B
Earth collided with a large object, forming the moon.C
Single-celled organisms released oxygen into the air when they photosynthesized.D
Single-celled organisms absorbed harmful gases from the air when they first formed.22
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Which statement explains something that the fossil record indicates?
A
Earth is is still a very young planetB
Mammals have always existed on Earth.C
Mass extinctions have occurred several times on Earth.D
The amount of water on Earth has decreased over time.23
What happens to soft parts of organisms when cast fossils form?
A
They decay.B
They petrify.C
They form carbon films.D
They become part of the fossil.24
Which is the correct formula for calculating the age of a meteorite if using half-life?
A
Age of object =
B
Age of object =
C
Age of object =
D
Age of object =
25
Study the graph about oxygen content of Earth’s atmosphere.Which describes oxygen content as Earth evolved over time?
A
Oxygen levels sharply declined about 400 million years ago.B
Oxygen levels stay above 15 percent starting 200 million years agoC
Oxygen levels remain below 5 percent starting 1000 million years ago.D
Oxygen levels raise significantly between 1000 and 700 million years ago.Did you find these answers helpful?
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