How We Classify Rocks

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

• sedimentary rock

• fossil

• metamorphic rock

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

• fossil

• rock cycle

• magma

• rock slide

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.

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

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

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

When magma cools slowly below the Earth’s surface,.........mineral crystals form

• Small

• Large

• Same size

Metamorphic rocks form from ___.

• igneous rocks
• other metamorphic rocks
• sedimentary rocks
• all types of rocks

For any rock to become igneous rock, it must first melt to become magma, then cool to form igneous rock.

• True

• False