Metamorphic rocks can commonly be found in mountain ranges, like the Himalayas, Alps and Rocky Mountains. This is because metamorphic rocks form at the core of mountains from the intense pressure and heat. As mountains erode away over time, these types of rocks can be found on the surface.
The Appalachian Mountains is another area where these rocks can be found. These mountains used to be very large, but over a large period of time they eroded significantly, leaving metamorphic rocks exposed. There are two main types of metamorphic rocks. the first are called foliated metamorphic rocks and have a layered appearance, such as slate and phyllite. Non-foliated metamorphic rocks include marble and quartzite. Marble doesn't have the foliated, banded or layered look because it forms through intense heat, not pressure.