GEOLOGY

Detailed explanation-1: -Contact Metamorphism occurs when magma comes in contact with an already existing body of rock. When this happens the existing rocks temperature rises and also becomes infiltrated with fluid from the magma. The area affected by the contact of magma is usually small, from 1 to 10 kilometers.

Detailed explanation-2: -Contact metamorphism occurs adjacent to igneous intrusions and results from high temperatures associated with the igneous intrusion. Since only a small area surrounding the intrusion is heated by the magma, metamorphism is restricted to the zone surrounding the intrusion, called a metamorphic or contact aureole.

Detailed explanation-3: -Contact metamorphism. This is metamorphism produced by intrusion of magma. Heat and fluids from the crystallizing magma cause chemical and mineralogical changes in the rocks being intruded. Regional metamorphism.

Detailed explanation-4: -When molten material, such as that in an igneous intrusion, comes in contact with solid rock, a local effect called contact metamorphism occurs. When very hot water reacts with rock and alters its chemical and mineral composition, hydrothermal metamorphism occurs.

Detailed explanation-5: -Metamorphic rocks are formed by contact metamorphism because this metamorphism involves high temperatures that arise from igneous intrusion. This intrusion of magma changes the chemical structure of adjacent rock to generate metamorphic rock.