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Igneous rock is formed through the cooling and solidification of magma or lava. This magma may be derived from partial melts of pre-existing rocks in either a planet’s mantle or crust. Typically, the melting of rocks is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Sedimentary rocks are formed at the earth’s surface by the accumulation and cementation of fragments of earlier rocks, minerals, and organisms or as chemical precipitates and organic growths in water . This process causes clastic sediments or organic particles to settle and accumulate, or for minerals to chemically precipitate from a solution. The particulate matter then undergoes compaction and cementation at moderate temperatures and pressures .