Pls where do most metamorphic processes take place? a. at least a hundred kilometers below earth’s surface, in the mantle b. in the first few kilometers below earth’s surface c. at least a few kilometers below earth’s surface, in the lithosphere and upper mantle d. in the mantle and upper core

A. at least a hundred kilometers below Earth’s surface, in the mantle

Explanation:

Metamorphic rocks are rocks which are formed from existing rocks. They change their form which results in their formation. Examples include marble,Schist etc.

They are formed under conditions such as temperature greater than 150 to 200 °C and pressure of 1,000 bar and above thereby causing intense physical or chemical change.

Their formation occurs at least a hundred kilometers below Earth’s surface, in the mantle .