Fossils and Radioactive Dating 4.2

Front

What is a fossil?

Back

The preserved remains of an organism.

Front

What are trace fossils?

Back

Foot prints, burrows, or other impressions made by animals that give us clues to how they lived.

Front

How do fossils form?

Back

When things die and their remains are buried.

Front

What is 'half-life'?

Back

The time it takes for 1/2 of the radioactive atoms to decay in an element.

Front

What is radio active decay?

Back

Atoms in an unstable element break down to form another element.

Front

What is the relative age of a rock?

Back

The age determined by the things around it.

Front

What is the absolute age of a rock?

Back

The age determined by radioactive dating.

Front

What does radioactive dating work best to determine?

Back

The age of an igneous rock.

Front

What type of fossil is this? (Options: Mold, Cast, Preserved remains, Trace fossil)

Back

Cast

Front

What type of fossil is this? Mold, Cast, Preserved remains, Petrified

Back

Petrified