GENERAL GEOLOGY

Detailed explanation-1: -Most metamorphic reactions take place at very slow rates. For example, the growth of new minerals within a rock during metamorphism has been estimated to be about 1 mm per million years. For this reason, it is very difficult to study metamorphic processes in a lab.

Detailed explanation-2: -Time-Because metamorphism involves changing the rock while it is solid, metamorphic change is a slow process. During metamorphism, several processes are at work. Recrystallization causes changes in minerals size and shape.

Detailed explanation-3: -Most metamorphic processes take place deep underground, inside the earth’s crust. During metamorphism, protolith chemistry is mildly changed by increased temperature (heat), a type of pressure called confining pressure, and/or chemically reactive fluids.

Detailed explanation-4: -Which among the following statement(s) is true about metamorphic rocks? They are formed when rocks change their original shape and form due to intense heat or pressure.

Detailed explanation-5: -The main factors that control metamorphic processes are: The chemical composition of the parent rock. The temperature at which metamorphism takes place. The pressure applied, and whether the pressure is equal in all directions or not.