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谷子兄又在普及科普知识了,很喜欢!科学研究发现:
If our planet were perfectly flat and its water covered all the surface, it would create a layer 2.7 kilometers deep. While this seems like a lot, less than 3% of that is freshwater. Of that, nearly 70% is in ice caps, glaciers, and permanent snow, and 30% sits in ground water. Rivers, lakes, and clouds carry less than 1% of the world's freshwater.
如果我们的地球是一个完全平坦的星球,地球上的水覆盖其全部表面,就会在地球上形成一个2.7公里的水层。看起来很多,但其中只有3%是淡水,而这里面又有70%存在于冰盖、冰川和永久积雪之中,30%存在于地下水中,河流、湖泊和云层所含淡水不到全世界淡水的1%。