energy sources
energy sources Naturally occurring substances, processes and phenomena from which we obtain energy. The vast majority of energy derives from the Sun. Fossil fuels are the remains of life that depended for growth on solar energy. Hydroelectricity also derives from solar energy, which maintains the Earth's hydrological cycle, while uneven heating of the atmosphere generates wind, whose energy harnessed by wind farms. The movements of the oceans, namely waves and tides, controlled by wind and the pull of the Sun and Moon, have been used successfully in some regions to create energy. Increasingly, solar energy is being used to heat some domestic water supplies directly, and for providing electricity from photoelectric cells. Geothermal energy is energy obtained from underground hot rocks. See also nuclear energy; renewable energy
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energy sources