Unit 7 Lesson 2 Relative Dating

Front

What are traces or remains of organisms that lived long ago?

Back

Fossil

Front

What is a break in the geologic record made when rock layers are eroded over a long period of time?

Back

Unconformity

Front

Which property of fossils allows scientists to determine the relative ages of rock layers?

Back

Fossils show change over time as species evolve.

Front

What is an ordered arrangement of rock layers based on the relative ages of the rocks?

Back

Geologic Column

Front

What term describes how rocks have been disturbed?

Back

Igneous intrusion

Front

What principle states that in undisturbed rock layers, the oldest layers are at the bottom?

Back

Law of Superposition

Front

What is the process of determining the relative order of past events in geology?

Back

Relative Dating

Front

What is the term for a layer of rock that has been cut through by another geological feature?

Back

Law of Crosscutting Relationships

Front

What type of rock are fossils usually found in?

Back

Sedimentary rock

Front

What is the significance of fossils in understanding Earth's history?

Back

Fossils provide evidence of past life and environmental conditions.