Relative Dating

Question 1

The diagram shows horizontal rock layers.

Revolt · Accepted Answer

Layer C is younger than layer A.

Question 2

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 3

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

Revolt · Accepted Answer

extrusion

Question 4

Which phrase describes organisms that formed index fossils?

Revolt · Accepted Answer

are extinct

Question 5

How do index fossils help scientists?

Revolt · Accepted Answer

They aid in comparison of rock layers at distant locations.

Question 6

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 7

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 8

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 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 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.

Relative Dating Answers

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