Geologic Time Scale and the History of Earth

Front

What is the Geologic Time Scale?

Back

A system of chronological dating that relates geological strata to time, dividing Earth's history into eons, eras, periods, epochs, and ages.

Front

What are the main divisions of geologic time?

Back

Eons, eras, periods, epochs.

Front

What era is known as the 'Age of Mammals'?

Back

Cenozoic era.

Front

What significant event marks the beginning of the Paleozoic era?

Back

The Cambrian Explosion, which saw a rapid diversification of life.

Front

What is the approximate age of the Earth?

Back

4.6 billion years old.

Front

During which era did dinosaurs dominate the Earth?

Back

Mesozoic era.

Front

What is the significance of the Precambrian period?

Back

It encompasses the formation of the Earth and the emergence of the first simple life forms, including bacteria.

Front

What major climatic events occurred during the Cenozoic era?

Back

The ice ages.

Front

Which division of geologic time is the shortest?

Back

Epochs.

Front

What is a fossil and why is it important in geology?

Back

A fossil is the preserved remains or traces of ancient organisms, important for understanding Earth's history and the evolution of life.