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Energyability to do work
powermeasures work done
sunmost important source of energy
electricitycomes from electrons
nuclear reactionatomic particles hit each other and split apart
radioactiveparticles that give off radiation
caloriesmeasure of food energy
solar cellsconvert sunlight into electrical energy
wind farmlarge number of windmills centrally located
hydroelectricelectricity generated by turbines propelled by water
geothermalenergy in the ground caused by radioactive decay of elements
conservationmanagement and efficient use of all energy sources
recycleto reuse all or part of substances
greenhouse effectsteady increase in the earth's temperatrue
reserveamount of a resource that has not been mined and is still underground

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