Chapter 25 Earth's Materials

Rocks are classified by...

• how they were formed

• when they were formed

• where they were formed

When liquid magma is pushed out of a volcano and cools, it forms this type of rock:

• metamorphic

• igneous

• sedimentary

What process changes igneous rocks into sedimentary rocks?

• melting to form layers of different minerals

• creating new land by volcanoes

• weathering, erosion and deposition of rock

What process occurs to change sedimentary rock into igneous rock?

• sediments melted

• sediments compacted

• sediments weathered

What must have happened during the formation of igneous rocks?

• small sediments being compacted

• liquid rock changing its physical state

• solid rock changing

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What process could change igneous and sedimentary rocks into metamorphic rocks?

• erosion

• pressure

• weathering

What causes the different colors of layers in sedimentary rock?

• the cooling process of the magma

• the weather in the area

• different minerals and sediments in the rock

Igneous rocks might show that there once was _________ nearby.

• oceans

• volcanoes

• swamps

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The final process in the formation of sedimentary rock is...

• cementation

• melting

• cooling

What rocks are formed by extreme heat and pressure?

• metamorphic

• igneous

• sedimentary