What is the source of geothermal energy? user: what is the source of geothermal energy?
a. sunlight heating surface waters
b. the splitting of atoms to release energy
c. natural underground reservoirs of steam and hot water
d. very hot minerals deep underground

The answer is; C

In particular points in the earth’s surface, underground water is naturally heated to steam that can be harness for geothermal energy. The steam that ejects from the ground with high kinetic energy can be used to turn turbines that generate electricity. The underground water is usually heated by the hot rocks beneath that are subjected to the immense heat of magma or the enormous pressure of overlying crust.  

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