What Metamorphic Rock?

What metamorphic rock?

 

Answer:

Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The original rock is subjected to heat and pressure, causing profound physical or chemical change. The protolith may be a sedimentary, igneous, or existing metamorphic rock

p.s. :  A metamorphic rock is a type of rock which has been changed by extreme heat and pressure