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Igneous rock
A material that was once molten; it usually contains crystals that grew within this molten material as it cooled.
Metamorphic rock
Rocks made when heat or pressure (or both) cause a pre-existing rock to recrystallize, but without melting.
Sedimentary rocks
Rocks formed at the surface, by deposition of detrital grains or by precipitation from solution in water.
The Rock Cycle
The cycle of how rocks and minerals are continuously formed, deformed, and then reformed through weathering, melting, cooling, heat, and pressure.