Say defenation of Igneous Rock
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When magma erupts and cools down to form hard objects, they are called igneous rocks.
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Igneous rock, or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust.
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