Answers

2014-01-29T18:36:04+08:00
Plants and trees provide oxygen, so there wot be any air pollution in a forest. they also have roots, so it also prevents floods because they will absorb MANY amount of water in the flood.
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they are not asking about air pollution they are asking of erosion..
2014-01-29T18:59:39+08:00
trees are planted at the edge of the fields and serve as wind breakers.
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