b) What are the only two sources of energy that produce all the energy we use on Earth? What form
of energy does each of these sources use?

Solar and nuclear power generate more than 99 percent of our civilization's energy. Every other important source of energy is a combination of these two. The majority of them are solar in nature. We discharge previously collected solar energy when we burn wood.

and

Nuclear energy, fossil energy (oil, coal, and natural gas), and renewable energy (wind, solar, geothermal, and hydropower) are all examples of primary energy sources.

Explanation:

b) What are the only two sources of energy that produce all the energy we use on Earth? What form of energy does each of these sources use?

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b) What are the only two sources of energy that produce all the energy we use on Earth? What form
of energy does each of these sources use?