Classify Rocks

As a volcano erupts, it produces lava. As this lava flows, it cools down and hardens, forming a rock. How would you classify this rock?

• as molten rock

• as a sedimentary

• as a metamorphic

• as an igneous rock

A metamorphic rock can also be thought of as rock that changes. What causes the rock to change?

• Layers of sediment building up over time and pressing down, forming rock

• rain, wind, freezing, thawing, and plant roots growing cause the rock to erode away, leaving behind sediment

• Extreme heat and pressure from deep within earth cause changes to the rock's appearance, structure, and composition.

• the rock slowly changes over time into a new rock

Tags

NGSS.MS-ESS2-1

A rock that is changed by heat and pressure deep inside Earth.

• sedimentary rock

• fossil

• metamorphic rock

Tags

NGSS.MS-ESS2-1

Emily is sorting the rocks in her collection. One of her rocks is a limestone rock. It contains fossils. What category of rock should she classify limestone?

• igneous

• metamorphic

• sedimentary

Tags

NGSS.MS-LS4-1

This rock was formed by smaller pieces of rock that settled at the bottom of a lake millions of years ago. The sediments were compacted and cemented together. What type of rock is this?

• Sedimentary

• Metamorphic

• Igneous

The continuous process in which one type of rock changes into another type.

• fossil

• rock cycle

• magma

• rock slide

Tags

NGSS.MS-ESS2-1

How can a metamorphic rock become an igneous rock?

• If the rock passes through a rainbow it will become igneous.

• If it falls into a river it will become igneous.

• If it turns into a fossil it will become igneous.

• If a rock melts and cools it will become igneous.

The three groups of rocks are classified by

• How they form

• Color

• Grain size

• Chemical Composition

This type of rock is formed when you cool melted lava or magma.

• Sedimentary

• Igneous

• Metamorphic

Metamorphic rocks form from ___.

• igneous rocks

• other metamorphic rocks

• sedimentary rocks

• all types of rocks