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How Igneous Rocks Begin
- Igneous rocks form when hot magma cools and solidifies either below or above Earth’s surface.
- Crystals can grow inside these rocks as the magma cools at different rates.
Sediments Turn Into Rock
- Sedimentary rocks form when sediments like sand, dirt, plants, or shells accumulate, get buried, and are compacted.
- Water acts like glue (cement) to bind particles so they become rock over time.
Rocks That Change Without Melting
- Metamorphic rocks form when an existing rock is heated and squeezed but does not melt, causing it to change form.
- High temperature and pressure stretch, bend, or crush the rock into a new type of rock.