There are many sources of energy on earth. The original source of all this energy is nuclear energy in the universe. All other forms of energy are the result of nuclear energy trickling down into lower forms. The following are common sources of energy on earth:
Geothermal ..taking thermal energy from the earth's core
Falling water ..rivers, ocean tides
Wave motion ..in ocean
Thermal cycles ..in water and air
Wind motion ..of air
Pressure changes ..in atmosphere
Solar radiation ..from the sun
Fossil fuels ..coal, oil, natural gas
Biomass ..trees, plants
Fission nuclear energy ..splitting atoms
Fusion nuclear energy ..combining atoms
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