Science Unit 5 Review

Front

What is mass extinction?

Back

Many species become extinct over a short period of geologic time.

Front

What can cause mass extinction?

Back

No rain for long periods of time.

Front

What are index fossils?

Back

Fossils that formed at only one particular time, helping to determine the age of rock layers.

Front

How do index fossils help in dating rocks?

Back

They show the relative age of rock formations.

Front

What is relative dating?

Back

Determining the age of rocks or fossils by comparing their placement in layers.

Front

How can you demonstrate relative dating with newspapers?

Back

By describing the placement of the papers within the entire stack.

Front

What did scientists learn about woolly mammoths?

Back

They were able to live in the very cold climate of the ice age.

Front

What is an example of a condition that could lead to mass extinction?

Back

Long periods without rain.

Front

Why are index fossils important in geology?

Back

They help scientists understand the age and environment of rock layers.

Front

What does it mean if a fossil is an index fossil?

Back

It indicates a specific time period in Earth's history.