when nuclei of small atoms combine to release energy

what is used in an active solar system that is not used in a passive solar system

a well that is drilled to reach hot water heated by magma is harnessing

energy resources that exist in limited amounts and cannot be replaced quickly are

energy sources that can be replaced at the same rate at which they are consumed are

energy produced by running water is

One large problem with mining and the use of coal is

Why have nations started turning to renewable energy (main reason)

mining underground

removing ore from stream or lake beds

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