The three primary types of rocks—igneous, metamorphic, and sedimentary—are formed over timescales ranging from a single day to millions of years. Extrusive rocks take only a few days to crystallize, compared to thousands of years for intrusive igneous rocks. Sedimentary and metamorphic rocks develop over millions of years.
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Any naturally occurring solid mass, aggregate, or substance composed of minerals or mineraloids is referred to as rock (or stone) in geology. It is characterized according to the minerals it contains, its chemical makeup, and how it is created. With the exception of the liquid outer core and few magma pockets in the asthenosphere, the Earth's crust, which makes up most of its interior, is made of rocks.
Numerous branches of geology, such as petrology and mineralogy, are used in the study of rocks.
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