Which of these is not currently a source of usable energy?
A sun
B moon
C running water
D heat from within Earth's crust
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The answer is B) Moon...
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Moon is not currently a source of usable energy. (Option B)
• There are different source of environmental renewable energy sources which are usable for ourselves.
• The lunar energy has also great scopes in the near future as a renewable energy source.
• But,the necessary technology and methodology are still not available to harness the lunar energy for a mass scale energy production.
• That's why we cannot say that the lunar energy is a usable source of energy.
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