A Trip Through Earth's History

Front

The process by which all the different kinds of living things have changed over long periods of time is called _____

Back

evolution

Front

A type of organism that no longer exists on Earth is said to be _____

Back

extinct

Front

____ can provide clues about the activities of ancient organisms.

Back

Trace fossils

Front

The geologic time scale is a record of _____

Back

the life forms and geologic events in Earth’s history

Front

The Paleozoic, Mesozoic, and Cenozoic are divisions in the geologic time scale called _____

Back

eras

Front

What is a fossil?

Back

A fossil is the preserved remains or traces of ancient organisms.

Front

What is sedimentation?

Back

Sedimentation is the process of settling or being deposited as sediment.

Front

What are trace fossils?

Back

Trace fossils are geological records of biological activity, such as footprints or burrows.

Front

What is the significance of the geologic time scale?

Back

The geologic time scale helps scientists understand the timing and relationships of events in Earth's history.

Front

What does extinct mean?

Back

Extinct means a species that no longer has any living members.