Science / Geology / Metamorphism: The changes of mineralogy and texture imposed on a rock by pressure and temperature in the Earth's interior. Meteoric water: Rainwater, snow, hail, and sleet.

Regional Metamorphism

Science / Geology / Regional Metamorphism: Metamorphism across a broad area caused by the elevated temperatures and pressures of plate collision or deep burial. MORE

Contact Metamorphism

Science / Geology / Contact Metamorphism: Mineralogical and textural changes and deformation of rock resulting from the head and pressure of an igneous intrusion in the near vicinity. MORE

Hydrothermal Metamorphism

Science / Geology / Hydrothermal Metamorphism: Alteration of rock by hot waters or gases associated with a magmatic source. MORE

Retrograde Metamorphism

Science / Geology / Retrograde Metamorphism: Mineral changes within a rock that are caused by adjustments to conditions of reduced temperature and pressure. MORE


Science / Geology / Gneiss: A coarse-grained, foliated rock produced by regional metamorphism. The mineral grains within gneiss are elongated due to pressure and the rock has a compositional banding due to chemical activity. Pic MORE


Science / Geology / Marble: A non-foliated metamorphic rock that is produced from the metamorphism of limestone. It is composed primarily of calcium carbonate. Picture of Marble. MORE