Front

What marks the end of the Mesozoic era?

Back

The appearance of hard parts in organisms.

Tags

NGSS.MS-LS4-1

Front

What type of fossil represents the preservation of actual remains?

Back

Body fossil.

Front

What is the smallest main unit of geologic time?

Back

Epochs.

Front

What are the divisions of geologic time in order from largest to smallest?

Back

Eons, eras, periods, epochs.

Tags

NGSS.MS-ESS1-4

Front

What principle states that geologic processes occurring today are similar to those that occurred in the past?

Back

Uniformitarianism.

Front

What is the term for a major division of geologic time that is longer than an era?

Back

Eon.

Tags

NGSS.MS-ESS1-4

Front

What is the term for a division of geologic time that is shorter than an era but longer than an epoch?

Back

Period.

Tags

NGSS.MS-ESS1-4

Front

What is the significance of the Cambrian Explosion in geologic time?

Back

It marks a rapid diversification of life and the appearance of hard-bodied organisms.

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

Front

What is the difference between relative dating and absolute dating in geology?

Back

Relative dating places events in order without exact dates, while absolute dating provides a specific age.

Front

What is the Law of Superposition?

Back

In undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top.

Tags

NGSS.MS-ESS1-4