The source of geothermal energy is___________________?
Correct answer: D. all as said in A - B and C
- A. decay of radioactive element in the earth
- B. compression of material in the earth
- C. residual lost of the earth
- D. all as said in A - B and C
Explanation
Geothermal energy comes from heat inside Earth, including heat released by radioactive decay, residual heat from Earth's formation, and heat associated with compression and gravitational settling of material. Thus all the listed sources contribute in the intended textbook treatment. The likely wrong choice is a because radioactive decay is an important source but not the only one.
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