Geologic Time Scale

Front

What is the duration of the Mesozoic Era?

Back

180 million years

Front

What is the longest time period in the geologic time scale?

Back

Eon

Tags

NGSS.MS-ESS1-4

Front

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

Back

Cenozoic Era

Tags

NGSS.MS-ESS1-4

Front

What is the duration of the Early Archean Era?

Back

2.5 billion years

Tags

NGSS.MS-ESS1-4

Front

What is the purpose of the geologic time scale?

Back

To identify when events occurred in Earth's history.

Tags

NGSS.MS-ESS1-4

Front

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

Back

Eons, Eras, Periods.

Tags

NGSS.MS-ESS1-4

Front

What is an Eon?

Back

The largest division of geologic time, lasting hundreds of millions to billions of years.

Tags

NGSS.MS-ESS1-4

Front

What is an Era?

Back

A subdivision of an Eon, lasting tens to hundreds of millions of years.

Tags

NGSS.MS-ESS1-4

Front

What is a Period?

Back

A subdivision of an Era, lasting millions of years.

Tags

NGSS.MS-ESS1-4

Front

What is an Epoch?

Back

A subdivision of a Period, lasting several million years.

Tags

NGSS.MS-ESS1-4