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| A rock is a natural substance composed of solid crystals of different minerals that have been fused together into a solid lump.There are three basic types of rock: igneous, sedimentary, and metamorphic. igneous rocks are volcanic and form from molten material.Sedimentary rocks are formed from eroded fragments of other rocks or even from the remains of plants or animals.Metamorphic rocks are sedimentary or igneous rocks that have been transformed by pressure, heat, or the intrusion of fluids. |
Saturday, July 31, 2010
But what exactly is a rock?
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