Geologic Time Scale

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, and epochs.

Tags

NGSS.MS-ESS1-4

Front

Order the divisions of geologic time from longest to shortest.

Back

Eons, Eras, Periods.

Tags

NGSS.MS-ESS1-4

Front

What are the two Eras during which mass extinctions occurred?

Back

Paleozoic and Mesozoic Eras.

Tags

NGSS.MS-LS4-1

Front

How old do Paleontologists believe the Earth is?

Back

Approximately 4.6 billion years old.

Tags

NGSS.MS-ESS1-4

Front

What does relative age tell us about a rock layer or fossil?

Back

It indicates the age of one rock layer or fossil compared to another.

Tags

NGSS.MS-ESS1-4

Front

In which time period are we currently living?

Back

Cenozoic Era.

Tags

NGSS.MS-ESS1-4

Front

What is an eon in the context of the Geologic Time Scale?

Back

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

Tags

NGSS.MS-ESS1-4

Front

What is an era in the context of the Geologic Time Scale?

Back

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

Tags

NGSS.MS-ESS1-4

Front

What is a period in the context of the Geologic Time Scale?

Back

A subdivision of an era, lasting millions of years.

Tags

NGSS.MS-ESS1-4

Front

What is the significance of the Paleozoic Era?

Back

It is known for the development of early life forms, including fish, amphibians, and reptiles.

Tags

NGSS.MS-LS4-1