GENERAL GEOLOGY

Detailed explanation-1: -Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.

Detailed explanation-2: -The two factors that produce metamorphic rocks are pressure and heat. Pressure comes from the rock being buried beneath the surface of the Earth. From the weight of the layers, the rocks are pressed together. Often, these rocks are compressed so much that they create layers.

Detailed explanation-3: -Heat sources include magma, geothermal heat, and friction along faults. Pressure sources include the weight of overlying rocks deep in the earth. Shear pressure in fault zones can metamorphose rocks at shallower depths. Chemical activity is usually caused by water at higher temperatures and pressures.

Detailed explanation-4: -The pressure experienced by a rock during metamorphism is due primarily to the weight of the overlying rocks (i.e., lithostatic pressure) and is generally reported in units of bars or kilobars. The standard scientific notation for pressure is expressed in pascals or megapascals (1 pascal is equivalent to 10 bars).