The presence of metamorphic rocks exposed today at the Earth's surface tells us that _______ has occurred.
A) subduction
B) metasomatism
C) foliation
D) erosion

Question

Quizplus · Accepted Answer

The presence of metamorphic rocks at Earth's surface indicates that erosion has occurred, exposing these rocks that were once located deeper within the Earth's crust. Subduction and metasomatism both involve processes that occur within the crust and do not necessarily result in the exposure of metamorphic rocks at the surface. Foliation is a characteristic feature of many metamorphic rocks, but it does not indicate whether or not these rocks have been exposed.

The Presence of Metamorphic Rocks Exposed Today at the Earth's