Unit Test — Unit test Answers

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Study the timeline.

130 million years ago

1.5 billion years ago

2.5 billion years ago

4.1 billion years ago

Which values do scientists compare when using potassium-argon dating?

the number of stable and unstable parent atoms

the number of non-decayed elements left in the rock

the amount of parent and daughter material trapped in the rock

the amount of gas from the decayed material that has escaped from rock

The diagram shows horizontal rock layers.

Layer C is younger than layer A.

Layer D has an older relative age than layer C.

If a geologic event tilted these layers, layer B would no longer be the oldest.

It is possible to determine the absolute age of layer C with the information given.

Which phrase describes the element carbon-14?

decays at an unknown rate

found in an organism’s remains

forms from the breakdown of nitrogen-14

is measured to determine the age of sedimentary rocks

Study the timeline.

Humans have only recently existed on Earth.

Organisms originally lived only on land.

Life on Earth started before water formed on Earth.

Multicellular life evolved before complex single-celled life.

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