Rocks are sedimentar, igneous and metamorphic with three primary forms. Any of these rocks consists of physical modifications — such as melts, cools, erodes, compacts or deforms — part of a rock period. Other current rock or organic material is composed of sedimentary rock.
There are three main types of rocks: sedimentary, igneous, and metamorphic. Each of these rocks are formed by physical changes—such as melting, cooling, eroding, compacting, or deforming—that are part of the rock cycle. Sedimentary rocks are formed from pieces of other existing rock or organic material.
