Rock (geology)
Rock is a substance composed of minerals and classified according to
mineral composition. Rocks are generally clasified 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
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