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shui tu liu shi xiao shi yan
Author(s): 
Pages: 20
Year: Issue:  6
Journal: A Friend of Pupils

Abstract: <正> 还记得1998年长江发生的特大洪灾吗?洪水发生其中一个重要原因就是长江中上游地区植被遭到破坏,水土流失了。黄河河水变黄,下游变成地上河也与水土流失有直接关系。让我们来做个实验验证一下吧!
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