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Rocks are classified into three groups based on how they are formed. Igneous rock is formed when magma cools and crystallizes. Sedimentary rock is formed when the products of weathering and erosion are compacted and cemented to form new rock. Metamorphic rock is formed when existing rock is changed by heat, pressure or chemical change into a new kind of rock.

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9y ago
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9y ago

By their mode of origin.

Volcanic

Sedimentary

Metamorphic

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13y ago

Igneous, Sedimentary, and Metamorphic

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12y ago

sedimentary, metamorphic and igneous

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Q: How are rocks classified into one of these three groups?
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