Geologic Time Scale

Front

What is the oldest time period in Earth's history?

Back

Early Archean Era

Tags

NGSS.MS-ESS1-4

Front

What is the most recent time period in Earth's history?

Back

Cenozoic Era

Front

What is the duration of an Eon?

Back

Hundreds of millions of years

Tags

NGSS.MS-ESS1-4

Front

What is the duration of a Period?

Back

Tens of millions of years

Tags

NGSS.MS-ESS1-4

Front

What is the duration of the Late Cenozoic Epoch?

Back

1 million years

Tags

NGSS.MS-ESS1-4

Front

What are the four main Eons of the Geologic Time Scale?

Back

Hadean, Archean, Proterozoic, Phanerozoic

Tags

NGSS.MS-ESS1-4

Front

What is the significance of the Cambrian Explosion?

Back

It marks a rapid diversification of life forms on Earth.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

Front

What is the difference between an Era and a Period?

Back

An Era is a larger division of time than a Period.

Tags

NGSS.MS-ESS1-4

Front

What major events define the Mesozoic Era?

Back

The age of dinosaurs and the breakup of Pangaea.

Tags

NGSS.MS-ESS2-3

NGSS.MS-LS4-1

Front

What is the current Epoch we are living in?

Back

Holocene Epoch