Rock formed from very hot, molten material. An atom or group of atoms bearing a positive or negative charge as a result of having lost or gained one or more electrons. Rock derived from older rock by the action of heat, pressure, or chemical change. A substance of inorganic origin having a composition that could be expressed by a chemical formula. Its elements may be metallic or nonmetallic.
Most minerals have a crystalline structure.
The form and structure of the Earth's surface features viewed as a product of erosion, weathering, and glaciation. A normal geological fault. Rock produced by deposits of disintegrated matter from older rock forms, by deposits of animal or plant remains, or by chemical precipitates. The study of the Earth's strata. A layer of rock having distinct upper and lower boundaries.