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Rocks
The rocks are divided into metamorphic rock, sedimentary rock and igneous rock.
Sedimentary rock are types of rock that is formed by sedimentation of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles (detritus) to settle and accumulate minerals to form compacted material. Particles that form a sedimentary rock by accumulating are called sediment.
The oldest type of rocks is the igneous rock. The word "igneous" comes from a Greek word for fire. Deep inside the earth, the temperature is very high and the minerals there are in liquid form called magma. As the magma pushes towards the earth's surface, it starts to cool and turns into solid igneous rock.
The name for rocks that has been changed is metamorphic rocks. Metamorphic has a Greek meaning: "change" and "form".
The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock.