Unit 2 Lesson 2

Question 1

Relative dating

Answer 1

Determining whether an object or event is older or younger than other objects or events

Question 2

Law of superposition

Answer 2

States that younger rocks lie above older rock if the layers have not been disturbed

Question 3

Tilting

Answer 3

Happens when Earth’s forces move rock layers up or down unevenly.

The layers become slanted

Question 4

Folding

Answer 4

The bending of rocks that can happen when rock layers are squeezed together

Question 5

Fault

Intrusion

Answer 5

A break or crack in earth’s crust where rocks can move

Igneous rock that forms when magma is injected into rock then cools and becomes hard

Question 6

Unconformity

Answer 6

A break in the geologic record that is made when rock layers are eroded or when sediment is not deposited for a long period of time

Question 7

Fossils

Answer 7

The traces or remains of an organism that lived long ago most commonly preserved in sedimentary rock

Question 8

Geologic column

Answer 8

An ordered arrangement of rock layers that is based on the relative ages of the rocks with the oldest rocks at the bottom of the column

Question 9

Law of Original Horizontality

Answer 9

Sedimentary rock layers are deposited horizontally. If they are tilted, folded, or broken it happened later

Question 10

Law of Cross-Cutting

Answer 10

If an igneous intrusion or a fault cuts through existing rock, the intrusion/fault is younger than the rock