Geological History and Time

Front

Centuries when scientists realized that Earth has a long history

Back

18th and 19th

Front

Geologic time scale

Back

A sequence of events by using the principles of relative dating.

Front

Leader of the expedition down the Colorado River and through the Grand Canyon

Back

Major John Wesley Powell

Front

Evidence for an ancient Earth

Back

Concealed in the rocks.

Front

Records geological events and changing life forms of the past

Back

Rocks

Front

What erosion removes

Back

Earth’s rock record.

Front

Revolutionized the way people think about time and how they perceive our planet

Back

The geological time scale.

Front

What we learned about Earth and what changed it

Back

Earth is much older and has been changed by a geological process.

Front

Goal of a geologist

Back

To interpret Earth’s history.

Front

What studying rocks helps people understand

Back

The past.