世界水资源包括地球上所有的(气态、液态或固态)天然水。其中可供我们利用的为海水、河水和湖水;其他可利用的为潜水和深层地下水、冰川和永久积雪。水是地球上最普遍的溶剂,它溶解矿物盐,保证植物和微生物获得营养物质,没有水地球上就不可能有复杂的 World water resources include all natural (gaseous, liquid or solid) natural water on Earth. Among the available for our use of seawater, river water and lakes; other available for diving and deep groundwater, glaciers and permanent snow. Water is the most common solvent on Earth. It dissolves mineral salts and assures that plants and microbes obtain nutrients. Without water, it is impossible to have complex