Explain how contact and regional metamorphism occur 1,contact metamorphism? 2,Regional Metamorphism?

1. Contact metamorphism occurs when rocks are subjected to high temperatures and pressures due to contact with a magma intrusion. This type of metamorphism typically occurs in the vicinity of igneous intrusions, such as lava flows or magma chambers. The heat and pressure from the magma cause the surrounding rocks to recrystallize and change mineral composition, resulting in the formation of new minerals and textures. Contact metamorphism is typically localized and affects rocks within a few meters to a few kilometers of the intrusion.

2. Regional metamorphism occurs over a larger geographic area and is associated with tectonic processes such as mountain building or plate collisions. This type of metamorphism is caused by high temperatures and pressures deep within the Earth's crust, often at depths of several kilometers. Regional metamorphism typically affects large volumes of rock and can result in the formation of regional metamorphic belts. Rocks undergoing regional metamorphism may exhibit foliation, or layering, due to the alignment of minerals in response to the directed pressure. Regional metamorphism can also result in the formation of new minerals and textures, as well as the recrystallization of existing minerals.