Main Page | See live article | Alphabetical index Rock is a substance composed of minerals and classified according to mineral composition. Rocks are generally classified by the processes that formed them, and are thus separated into igneous, sedimentary, and metamorphic rocks. Igneous rocks are formed from molten magma, sedimentary rocks by deposition and compression of particulate matter, and metamorphic rocks by either of the first two categories after being changed by the effects of temperature and pressure. In cases where organic material leaves behind an imprint of itself in rock, the result is known as a fossil. See also: List of rocks List of minerals and stone types List of stone Quarrying Rock used in sculpting. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.