test 2.3 review

Front

What is a species of animals that once lived on Earth but which no longer exists?

Back

Extinct

Front

Which period are we currently in?

Back

Quaternary

Front

According to the law of superposition, which layer is the youngest?

Back

Layer A

Front

Where would the oldest rock be found?

Back

Layer O

Front

What dating tool requires multiple rock layers?

Back

Relative dating

Front

What is the term for a species that is at risk of extinction?

Back

Endangered

Front

What is the geological time scale?

Back

A system that describes the timing and relationships of events in Earth's history.

Front

What is an index fossil?

Back

A fossil that is used to define and identify a particular time period.

Front

What does the law of superposition state?

Back

In undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top.

Front

What is absolute dating?

Back

A method of determining the exact age of a rock or fossil.