MCQOPTIONS
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				| 1. | 
                                    The source of geothermal energy is___________________? | 
                            
| 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 | 
| Answer» E. | |