Rock Royalty-Free Stock Photo

Rock, is a mixture of solid minerals or mineral, below the surface of rock known as the reef, reefs and reef, consisting of one or more minerals, has a certain structure of the collection, there are a few contain biological remains or sites (fossil). Minerals have three states: solid, gas (gas), liquid (such as oil), but they are mainly solid matter, is one of the material of the earth's crust, is constitute the main components of the lithosphere.