Rocks and Minerals Review

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What are minerals?

Back

Minerals are pure substances made of only one kind of atom or molecule.

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What is an example of a mineral?

Back

Gold is made of only one kind of atom, and quartz is made of only one kind of molecule.

Front

What are rocks?

Back

Rocks are mixtures of two or more minerals.

Front

What is an example of a rock?

Back

Granite is a rock made of three different minerals: quartz, feldspar, and mica.

Front

What are the three types of rocks?

Back

Igneous rocks, Sedimentary rocks, Metamorphic rocks.

Front

How do igneous rocks form?

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Igneous rocks form when very hot, melted rock called magma cools down and becomes solid.

Front

What are the two main types of igneous rock?

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Intrusive igneous rock and Extrusive igneous rock.

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What is intrusive igneous rock?

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Intrusive igneous rock forms when magma cools slowly underground, making large crystals. Granite is an example.

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What is extrusive igneous rock?

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Extrusive igneous rock forms when lava cools quickly on the Earth's surface, making small crystals. Basalt and obsidian are examples.

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How do sedimentary rocks form?

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Sedimentary rocks form from bits of other rocks that pile up on the Earth's surface and cement together over time.