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水迴圈透過各個環節,使大氣圈、水圈、岩石圈和生物圈相互聯絡起來,並在它們之間進行能量交換;水在運動中夾帶溶解物質和泥沙而使物質遷移;透過水迴圈運動,使各種水體相互轉化,使水資源形成不斷更新的統一系統.
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