Final answer:
Contact metamorphism is the process where hot magma interacting with existing rocks leads to the formation of metamorphic rocks without foliation.
Explanation:
Contact metamorphism occurs when a body of magma intrudes into the upper part of the crust, resulting in temperature increases in the existing rock it contacts. This process leads to the formation of new metamorphic rocks without the development of foliation. The metamorphosed rock surrounding the magma body is known as an aureole.
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