Question

Under what conditions can igneous rock be transformed into metamorphic rock? A) if it is forced deep into Earth, where it melts into magma B) if it is heated and put under pressure for long periods of time C) if layers of sand accumulate over it and harden over a period of time D) if it is exposed at the surface and is weathered over a period of time

Answer 1

B)if it is heated and put under pressure for long periods of time

If the temperature was too hot, it would become magma instead and the cycle would start all over again.