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2c-ana, ez berristagarriak! hauek dira erregai fosilak, energi trukaketak ???? ????, ENERGIA hau da energi trukaketak, ENERGIA aurkesten da : energia erak, energia potenziala hau da: gorputzak duten posizioa lurrengatik, ENERGIA hau da energi iturriak, energi iturriak ???? ????, ???? ???? ????, energi iturriak bat ez berristagarriak!, energia zinetikoa hau da: gorputzak mugimenduan