In geology, a rock (or 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.

Look up Rock, Rocks, rock, or rocks in Wiktionary, the free dictionary.: Rock most often refers to: . Rock (geology), a naturally occurring solid aggregate of minerals or mineraloids Rock music, a genre of popular music; Rock or Rocks may also refer to:

The rock cycle is how rocks of one kind change into rocks of another kind.. There are three main kinds of rocks: igneous rock, metamorphic rock, and sedimentary rock.Each of these rocks can change into the other kinds by physical processes: cooling, melting, heat, weathering/erosion, compacting (squeezing tightly together), cementing, and pressure. ...