Pretest

Question 1

Which correctly lists three different geologic features that help scientists determine the relative ages of rocks by their positions?

Revolt · Accepted Answer

index fossils, intrusions, and cross-cutting relationships

Question 2

Which event is most likely if an index fossil is found in a layer at location 1, but the layer and index fossil are not found at location 2 nearby, which is known to be the same relative age?

Revolt · Accepted Answer

The organism did not exist at location 2.

Question 3

Which phrase describes the absolute age of a rock?

Revolt · Accepted Answer

is the number of years since it formed

Question 4

A geologist finds four layers of sedimentary rock. She determines that no geologic events have shifted the layers. She labels the layers A, B, C, and D from the top to the bottom. Which statement about these layers is accurate?

Revolt · Accepted Answer

B is younger than D.

Question 5

Which statement explains one reason why unconformities occur?

Revolt · Accepted Answer

No sediment is deposited over a long time.

Question 6

In which situation is the principle of cross-cutting relationships useful in determining relative age?

Revolt · Accepted Answer

A fault breaks through sedimentary layers.

Question 7

Which characteristic is shared by intrusions and faults?

Revolt · Accepted Answer

All are younger than surrounding rocks.

Question 8

Which feature forms at Earth’s surface from the cooling of lava?

Revolt · Accepted Answer

extrusion

Question 9

A geologist finds some tilted sedimentary rock layers. Which conclusion can the geologist draw by looking at the rock layers?

Revolt · Accepted Answer

They were originally deposited horizontally.

Question 10

Which phrase describes organisms that formed index fossils?

Revolt · Accepted Answer

are extinct

Pretest Answers

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