There are 3 large classifications of rocks - igneous, metamorphic, and sedimentary. Each type of rock is formed differently and can change from one type to another over time. The way rocks are formed determines how we classify them.
Igneous Rocks
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Topic Tip
- Igneous rocks are made by the melting and cooling of magma or lava.
- Intrusive igneous rocks cool down slowly beneath the surface.
- Extrusive igneous rocks cool down rapidly on the surface.