During what is the rock is heated by nearby magma?

When rock is heated by nearby magma, the process is known as contact metamorphism. In this process, the intense heat from the magma alters the mineral composition and texture of the surrounding rock without causing it to melt. This can lead to the formation of new metamorphic rocks, characterized by changes such as recrystallization or foliation. The degree of metamorphism depends on the temperature of the magma and the duration of exposure.