Geologic Time Scale Eras and Events

Front

What are the three main divisions of the geologic time scale?

Back

Paleozoic, Mesozoic, and Cenozoic.

Front

What is the term for the divisions in the geologic time scale?

Back

Eras.

Front

What event is believed to have caused the mass extinction of dinosaurs at the end of the Cretaceous period?

Back

An object from space struck Earth.

Front

Why is studying fossils important?

Back

It provides information about how life and environmental conditions may have changed.

Front

How old do paleontologists believe the Earth is?

Back

4.6 billion years old.

Front

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

Back

Cenozoic.

Front

What does the Paleozoic Era represent in the geologic time scale?

Back

It is the era that preceded the Mesozoic Era, characterized by the development of early life forms.

Front

What significant event marks the end of the Mesozoic Era?

Back

The mass extinction event that wiped out the dinosaurs.

Front

What is the significance of the Cenozoic Era in terms of biodiversity?

Back

It is marked by the rise of mammals and birds, leading to a significant increase in biodiversity.

Front

What are the main periods within the Mesozoic Era?

Back

Triassic, Jurassic, and Cretaceous.