Geologic Time Scale

Front

What is the Geologic Time Scale?

Back

A system of chronological dating that relates geological strata to time, used to describe the timing and relationships of events in Earth's history.

Tags

NGSS.MS-ESS1-4

Front

When did life first appear on Earth according to the fossil record?

Back

3.5-3.8 billion years ago.

Tags

NGSS.MS-LS4-1

Front

What are the two Eras where mass extinctions occurred?

Back

Paleozoic and Mesozoic Eras.

Tags

NGSS.MS-LS4-1

Front

Which vertebrates have been around longer: mammals or reptiles?

Back

Reptiles.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

Front

Which evolved first according to the fossil record: vertebrates or invertebrates?

Back

Invertebrates.

Tags

NGSS.MS-LS4-1

Front

What came first in Geologic Time: Cenozoic Era, Mesozoic Era, Paleozoic Era, or Precambrian Time?

Back

Precambrian Time.

Tags

NGSS.MS-ESS1-4

Front

What is the significance of the Precambrian Time?

Back

It is the earliest part of Earth's history, covering about 88% of Earth's geological time.

Tags

NGSS.HS-ESS1-6

Front

What major event marks the end of the Paleozoic Era?

Back

The Permian-Triassic extinction event, the largest mass extinction in Earth's history.

Tags

NGSS.MS-LS4-1

Front

What is the Mesozoic Era known for?

Back

It is known as the age of reptiles, including dinosaurs, and the emergence of mammals and birds.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

Front

What major event marks the end of the Mesozoic Era?

Back

The Cretaceous-Paleogene extinction event, which led to the extinction of the dinosaurs.

Tags

NGSS.MS-LS4-1