Earth's primary energy source is
A) the Sun.
B) fossil fuel.
C) electricity.
D) geothermal.
Correct Answer:
Verified
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Q68: Solar power is commonly used to produce
A)heat.
B)electricity.
C)both
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Q73: Hydrogen, like electricity, is
A)an energy source.
B)not an
Q74: The most concentrated form of energy is
A)wind.
B)fossil
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