AnswersDRHS GA-GSE Earth SystemsUnit Test

Unit Test — Unit test Answers

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Which statement accurately describes radioactive dating?

A
Geologists use only one type of radioactive dating.
B
Geologists compare parent and daughter elements to determine rock type.
C
Geologists will measure how stable multiple parent elements can decay into multiple daughter elements.
D
Geologist compare the observed abundance of naturally occurring radioactive isotopes and their decay products using decay rates.
22
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Which statement explains something that the fossil record indicates?

A
Earth is is still a very young planet
B
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

Study the timeline.

Question illustration
A
Humans have only recently existed on Earth.
B
Organisms originally lived only on land.
C
Life on Earth started before water formed on Earth.
D
Multicellular life evolved before complex single-celled life.
24

The graph shows calculations for potassium-argon dating.

Question illustration
A
They can estimate that all the potassium will have decayed within 6.5 billion years.
B
They can tell that 1/8 of the argon gas will be left after 3.9 billion years.
C
They can determine that a rock is 1.3 billion years old if 1/2 of the potassium has decayed.
D
They can see that potassium’s half-life varies from every 1.3 billion years to every 5.2 billion years.
25

Which characteristic is shared by intrusions and faults?

A
All are cracks.
B
All are igneous rocks.
C
All cause gaps in the geologic record.
D
All are younger than surrounding rocks.

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