Dating Rock Layers & Fossils

Front

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

Back

Fossil

Front

How old is the Earth?

Back

4.6 billion years

Front

What does the Principle of Cross-Cutting Relationships state?

Back

An igneous intrusion is always younger than the layers it cuts across.

Front

What type of rock formation is labeled as an igneous intrusion?

Back

Igneous intrusion.

Front

What type of rock results from the melting and cooling of magma?

Back

Igneous rock.

Front

What is the process called when sedimentary rock layers are formed?

Back

Lithification.

Front

What is the term for the age of a rock layer compared to other layers?

Back

Relative age.

Front

What is the method used to determine the exact age of a rock or fossil?

Back

Radiometric dating.

Front

What type of rock is formed from the accumulation of sediments?

Back

Sedimentary rock.

Front

What is the term for the layers of rock that are stacked on top of each other?

Back

Strata.