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They can be hard, soft, light or dark, sharp or blunt, depending on what kind of rock.
They are classified as igneous, metamorphic, and sedimentary.
Igneous rocks mostly come from near volcanos or lava that is cooled down into rock.
Metamorphic rocks are rocks that were put under pressure by intense heat and Earth's pressure. Metamorphic rocks may be former igneous or sedimentary rocks.
Sedimentary rocks are those formed by sediments, either from water currents, or by erosion, thus the name sedimentary. Natural weathering can create sedimentary rocks by moving sediments to different places.
-Sam