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:
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