Metamorphism example sentences

Metamorphism occurs when rocks are forced down to lower levels by tectonic processes or when molten magma rising through the crust comes in contact with the crustal rocks or the underlying rocks are subjected to great amounts of pressure by overlying rocks.The materials of rocks chemically alter and recrystallise due to thermal metamorphism.There are two types of thermal metamorphism — contact metamorphism and regional metamorphism.Types of metamorphic rocks depend upon original rocks that were subjected to metamorphism.In the process of metamorphism in some rocks grains or minerals get arranged in layers or lines.In contact metamorphism the rocks come in contact with hot intruding magma and lava and the rock materials recrystallise under high temperatures.In regional metamorphism, rocks undergo recrystallisation due to deformation caused by tectonic shearing together with high temperature or pressure or both.Metamorphism is a process by which already consolidated rocks undergo recrystallisation and reorganisation of materials within original rocks.Mechanical disruption and reorganisation of the original minerals within rocks due to breaking and crushing without any appreciable chemical changes is called dynamic metamorphism.