Completar frases Oceans and rivers1Versión en línea Fill in the gaps with the appropriate words. por Gabriel Pérez Comendador 1 mass smaller water water Earth big moving mass Waves down rivers sea An ocean is a of salt which covers a area of the surface of The . A sea is a of salt which covers a area . The water is always because of : ( caused by the wind ) . Currents ( they are like ) . Tides ( movements up and of the level of the ) .
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