Living organisms require available energy to stay alive, such as the energy humans get from food. Human civilization requires energy to function, which it gets from energy resources such as fossil fuels, nuclear fuel, or renewable energy. The processes of Earth's climate and ecosystem are driven by the radiant energy Earth receives from the sun and the geothermal energy contained within the earth.\n\nAnswer this question based on the passage: where does the energy for most external processes on the earth come from? Let's give stream of consciousness first:
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To answer the above question, the relevant sentence is: The processes of Earth's climate and ecosystem are driven by the radiant energy Earth receives from the sun and the geothermal energy contained within the earth.
So, the final answer is the radiant energy Earth receives from the sun and the geothermal energy contained within the earth.
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