Why are metamorphic rocks so limited in their distribution at the earth s surface?

   Metamorphic rocks are formed by processes that take place in the depths of the Earth

Explanation:  Metamorphic rocks are found in the depths of the Earth because they occur during the processes that take place there. This means that all types of rocks are not evenly distributed due to the processes they occur, so that some rocks, such as sediment, are more present on the surface and easier to find. Metamorphic rocks can reach and be found on the surface due to tectonic movements that push the rocks up. But still, these layers of metamorphic rocks that reach the surface are below some layers of other rocks. In order to find these metamorphic rocks on the surface, wind and water play an important role in the washing of the surface layers of rocks over the centuries, and thus make easier to find metamorphic rocks.