Regional metamorphism is the creation of metamorphic rock from large geographically significant processes like plate tectonics. Contact metamorphism is the creation of metamorphic rock from the proximity of an existing rock to a heat source provided by a plutonic intrusion.
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contact metamorphism
Both contact and regional metamorphism result in new types of rock from pre-existing types of rock whether it be from recrystallization, new crystal formation, or realignment of existing minerals.
It is called contact metamorphism.
They can be found at the Earth's surface due to uplift, weathering, and erosion, but are formed at some depth. An exception would be surface rock that is metamorphosed by heat and pressure from meteorite impact or that which is formed by contact metamorphism due to igneous intrusive or extrusive activity.