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Types of Rocks
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Igneous
Igneous rocks form from the cooling and solidification of magma or lava. They are generally hard and crystalline. Examples are granite and basalt.
Sedimentary
Sedimentary rocks are formed by deposition and cementation of material at the Earth's surface and within bodies of water. Examples include limestone and sandstone.
Metamorphic
Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means 'change in form'. The original rock is subjected to heat and pressure, causing profound physical and/or chemical change. Examples are marble and schist.
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