Earthworks or earth arts is an art movement in which landscape and the work of art are inextricably linked. It is also an art form that is created in nature, using natural materials such as soil, rock (bed rock, boulders, stones), organic media (logs, branches, leaves), and water which introduced materials such as concrete, metal, asphalt, or mineral pigments. Sculpture is not placed in the landscape rather, that landscape is the means of their creation.