Final answer:
Metamorphic rocks become changed versions of other rocks through high heat and pressure. The minerals within the rock undergo recrystallization, resulting in a new rock with an altered appearance.
Step-by-step explanation:
Metamorphic rocks become changed versions of other rocks through high heat and pressure. When a pre-existing rock is subjected to these conditions, the minerals within the rock undergo recrystallization, changing their size, shape, and/or composition. The end result is a new rock with an altered appearance. The type of metamorphic rock that forms depends on the original rock and the specific conditions of the metamorphic event.