Relative Dating

Question 1

Which statement explains one reason why unconformities occur?

Revolt · Accepted Answer

No sediment is deposited over a long time.

Question 2

The diagram shows horizontal rock layers.

Revolt · Accepted Answer

Layer C is younger than layer A.

Question 3

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 4

Which phrase describes organisms that formed index fossils?

Revolt · Accepted Answer

are extinct

Question 5

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 6

The image shows sedimentary rock layers with index fossils and a fault.

Revolt · Accepted Answer

Layer 2 and layer 9 are the same relative age.

Question 7

Which phrase describes the absolute age of a rock?

Revolt · Accepted Answer

is the number of years since it formed

Question 8

The diagram shows horizontal rock layers.

Revolt · Accepted Answer

Layer D is the youngest layer.

Question 9

Which is the first step that geologists must do to compare rock layers at distant locations?

Revolt · Accepted Answer

identify index fossils in one or more layers at one location

Question 10

Which characteristic is shared by intrusions and faults?

Revolt · Accepted Answer

All are younger than surrounding rocks.

Relative Dating Answers

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