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Sci 2144 Join now to read essay Sci 2144 Lashawone Powell October 6, 2005 SCI 2144 The three major types of rocks, igneous, sedimentary, and metamorphic rocks are interrelated by a series of natural processes. Igneous rocks form from the cooling and crystallization of hot molten lava and magma. Igneous rocks undergo weathering and erosion.