Relative Dating

Question 1

How do index fossils help scientists?

Revolt · Accepted Answer

They aid in comparison of rock layers at distant locations.

Question 2

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 3

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 4

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

Revolt · Accepted Answer

extrusion

Question 5

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 6

The diagram shows horizontal rock layers.

Revolt · Accepted Answer

Layer C is younger than layer A.

Question 7

This diagram shows rock formations forming.

Revolt · Accepted Answer

Formations 1 and 2 are igneous rock.

Question 8

Which characteristic is shared by intrusions and faults?

Revolt · Accepted Answer

All are younger than surrounding rocks.

Question 9

The diagram shows horizontal rock layers.

Revolt · Accepted Answer

Layer D is the youngest layer.

Question 10

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

Relative Dating Answers

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