Unit Test Answers

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Which statement about how geologists study the ages of rock layers is true?

The law of superposition means that older rocks are on top.

Geologists can find the exact age of a rock by looking at its relative position.

The principle of original horizontality provides the basis for the law of superposition.

Relative age can be determined by using the concept of unconformity.

Layers 3 and 5 ✔ Layers 2 and 3Layers 5 and 6

Layers 3 and 5

Layers 2 and 3

Layers 5 and 6

Layers 1 and 2 ✔ Layers 7 and 9Layers 4 and 6

Layers 1 and 2

Layers 7 and 9

Layers 4 and 6

Which happened first?

Letter I was deposited.

Letter G occurred.

Letter F was deposited.

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