Relative Dating

Question 1

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 2

The diagram shows horizontal rock layers.

Revolt · Accepted Answer

Layer D is the youngest layer.

Question 3

Which phrase describes organisms that formed index fossils?

Revolt · Accepted Answer

are extinct

Question 4

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 5

The diagram shows horizontal rock layers.

Revolt · Accepted Answer

Layer C is younger than layer A.

Question 6

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 7

A scientist finds a fossil that she thinks might make a good index fossil.Which characteristic does this fossil most likely have?

Revolt · Accepted Answer

It is the remains of an organism that is found in abundance nearby.

Question 8

Which statement explains one reason why unconformities occur?

Revolt · Accepted Answer

No sediment is deposited over a long time.

Question 9

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 10

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.

Relative Dating Answers

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