Geologic Time Review

Front

How old is the Earth?

Back

The Earth is approximately 4.6 billion years old.

Front

What was the name of the supercontinent?

Back

The supercontinent was called Pangaea.

Front

Which group of organisms has existed for the shortest geologic time?

Back

Humans have existed for the shortest geologic time.

Front

What can you conclude about the ages of sedimentary rock layers?

Back

You can conclude their relative ages to each other.

Front

What is the largest division of time on the geologic time scale?

Back

The largest division is called an eon.

Front

What is a geologic time scale?

Back

A geologic time scale is a system of chronological dating that relates geological strata to time.

Front

What are the main divisions of the geologic time scale?

Back

The main divisions are eons, eras, periods, and epochs.

Front

What is the significance of fossils in geologic time?

Back

Fossils help scientists understand the history of life and the age of rock layers.

Front

What is relative dating?

Back

Relative dating is determining the age of rocks or fossils in relation to other rocks or fossils.

Front

What is absolute dating?

Back

Absolute dating is determining the exact age of a rock or fossil using methods like radiometric dating.