Geologic Time Study Guide

Present time is part of the Mesozoic era.

• True

• False

Tags

NGSS.MS-ESS1-4

Eons are longer units of time than Eras.

• True

• False

Tags

NGSS.MS-ESS1-4

The Precambrian consists of the three earliest eons of geologic time.

• True

• False

Tags

NGSS.MS-ESS1-4

The star on the time line indicates the beginning of the Precambrian.

• True

• False

Tags

NGSS.MS-ESS1-4

Mammals and dinosaurs both emerged during the Paleozoic Era.

• True

• False

Answer explanation

Mesozoic era

Earth’s oceans and atmosphere formed after life on Earth was established.

• True

• False

The Cambrian explosion refers to a rapid increase in volcanic activity.

• True

• False

Tags

NGSS.MS-LS4-1

Reptiles can reproduce on land, while amphibians need water to reproduce.

• True

• False

This timeline correctly shows the order of time periods in the Mesozoic Era.

• True

• False

Tags

NGSS.MS-ESS1-4

The radioactive decay scale divides the history of Earth into time units that help geologists analyze the rock record.

• True

• False

Answer explanation

Geologic time scale

Tags

NGSS.MS-ESS1-4