Igneous rocks and Sedimentary rocks
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Igneous rock , formed by the cooling of magma (molten rock) inside the Earth or on the surface. Sedimentary rocks, formed from the products of weathering by cementation or precipitation on the Earth's surface. ... All igneous rocks began as magma (molten rock) which cooled and crystallized into minerals.
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Igneous rocks form when molten rock (magma or lava) cools and solidifies.
Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water. They accumulate in layers.
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