What is the major source of heat for contact metamorphism?

deep burial and heat from the earth's interior

heat from grinding and shearing on faults

heat from the spontaneous decomposition of micas and feldspars

heat from a nearby magma body

What's a recharge area? a. the part of an aquifer where groundwater meets a lake or stream b. the part of an aquifer where surface water reaches the water table c. the part of an aquifer that's located between two aquicludes d. the part of an aquifer that's located at a lower elevation