Earth's Features

all the living and nonliving things in an area

• cement

• rock layer

• compact

• environment

to press together

• cement

• compact

• rock layer

• erosion

when rock, soil or sand is worn down and moved from one place to another by water, wind or ice

• erosion

• environment

• rock layer

• cement

to stick together in the process of forming rock

• rock layer

• compact

• cement

• erosion

a thick sheet of rock formed from the same material

• erosion

• cement

• rock layer

• environment

A sedimentary rock layer forms when sediment floats on the top of water and bakes in the sun.

• True

• False

Over a short amount of time, a rock layer becomes thicker as sediment continues to build up. It happens over the course of a couple of years.

• True

• False

Geologists use observations of and ideas about rocks and fossils to make inferences about past environments.

• True

• False

Which rock layer is the newest, or youngest, layer?

• siltstone

• mudstone

• sandstone

• limestone

Which rock is the oldest?

• siltstone

• mudstone

• sandstone

• limestone