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Three types of rock

Part of Hall of Planet Earth.

Three Types of Rock

Exhibition Text

There are three kinds of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water. They accumulate in layers. Metamorphic rocks result when existing rocks are changed by heat, pressure, or reactive fluids, such as hot, mineral-laden water. Most rocks are made of minerals containing silicon and oxygen, the most abundant elements in the Earth’s crust.

For Educators

Topic: Earth Science

Subtopic: Minerals and Resources

Keywords: Oxygen, Geology, Metamorphic rocks, Sedimentary rocks, Silicon, Igneous rocks

Audience: General