The origin of replication (also called the replication origin) is a particular sequence in a genome at which replication is initiated.
It is the interaction of two or more substances, resulting in chemical changes in them. Chemical reactions take place when some kind of energy is supplied to them. The supplied energy may be in the form of heat, light or mechanical shaking for proper contact between the reactant molecules or electricity.
This friction generates enough heat to melt the rocks at the point of contact. Heat For metamorphism to occur energy is needed to fuel the chemical reactions. Heat is the primary source of this energy.