Metamorphic rocks can only form igneous rocks. An igneous rock like granite can be formed into metamorphic rock like gneiss. Heat and pressure have no effect on rocks. One type of rock, such as shale, can change into several different kinds of metamorphic rock. The three types of metamorphism are Contact, Regional, and Dynamic metamorphism. 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. When granite is subjected to intense heat and pressure, it changes into a metamorphic rock called gneiss. Slate is another common metamorphic rock that forms from shale. Limestone, a sedimentary rock, will change into the metamorphic rock marble if the right conditions are met. We often find metamorphic rocks in mountain ranges where high pressures squeezed the rocks together and they piled up to form ranges such as the Himalayas, Alps, and the Rocky Mountains. Metamorphic rocks are forming deep in the core of these mountain ranges.
Metamorphic rocks form from heat and pressure changing the original or parent rock into a completelynew rock . The parent rock can be igneous , sedimentary or even another metamorphic rock.
