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Therearedifferentsourcesofenergy.Theriversandstreamsareagoodsourceforelectrieenergy.Thesanprovidesuswithlight,heatandelectricity.Thereisalsosoundenergyintheradiotransformedfromelectricenergy.Theenergycanbechangedfromoneformtoanother.Itcanneverbeexhaustednorreproduced.Itjustgoesonchangingincycles.
Itisimportantforustomakeuseofenergy.Solarenergyisbeingmadetogenerateelectricity,tocookandtobathe.Atomicenergyisusedinindustryandaviationandmanyotherfields.Wearenowdoingourbesttoinakeenergyserveourpeopleineverywaypossible.