rock
Sign in to savenaturally occurring solid aggregate of one or more minerals or mineraloids
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Rock is a naturally occurring solid made up of one or more minerals or mineraloid materials bound together. Rocks matter because they make up the Earth's crust and are fundamental to understanding geology, natural resources, and our planet's structure.
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The Grand Canyon, an incision through layers of sedimentary rocks.
In geology, a rock (also called a stone) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition, and the way in which it is formed. Rocks form the Earth's outer solid layer, the crust, and most of its interior, except for the liquid outer core and pockets of magma in the asthenosphere. The study of rocks involves multiple subdisciplines of geology, including petrology and mineralogy. It may be limited to rocks found on Earth, or it may include planetary geology that studies the rocks of other celestial objects.