How rocks are formed?
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Igneous rocks are formed when melted rock cools and solidifies. Melted rock may come in the form of magma, when it is found underneath the Earth's surface. It can also come in the form of lava, when it is released unto the Earth's surface during a volcanic eruption.
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The three main ways rocks are formed: Sedimentary rocks are formed through the gradual accumulation of sediments: for example, sand on a beach or mud on a river bed. ... Igneous rocks are rocks which have crystallized from a melt or magma.
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