Hence the definitions adopted in rock names simply correspond to selected points in a repeatedly graduated series. Igneous rocks are formed when magma cools in the Earth’s crust, or lava cools on the bottom surface or the seabed. The metamorphic rocks are formed when existing rocks are subjected to such giant pressures and temperatures that they’re transformed—one thing that occurs, for instance, when continental plates collide. The sedimentary rocks are fashioned by diagenesis or lithification of sediments, which in turn are shaped by the weathering, transport, and deposition of existing rocks.
The three main courses of metamorphic rock are primarily based upon the formation mechanism. An intrusion of magma that heats the encircling rock causes contact metamorphism—a temperature-dominated transformation. Pressure metamorphism happens when sediments are buried deep beneath the bottom; strain is dominant, and temperature plays a smaller position. This is termed burial metamorphism, and it can result in rocks … Read More