What are igneous rocks? How are they formed ?
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Igneous rocks form when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust. All magma develops underground, in the lower crust or upper mantle, because of the intense heat there.
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Igneous rock is one of the main rock type.Igneous rocks are formed when magma cools and crystallizes on the surface of the earth or fissures of crust
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