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This is true. Trees stop erosion which means they stop soil (silt) from washing into rivers and streams. Trees do this in three ways. First, the roots of the trees physically hold the soil in place. Second, the trees help slow down any rain or water that is running down a hill or slope. This means that the flowing water will pick up less soil or silt. Third, trees also drop leaves which create a layer of mulch which covers the soil and helps stop soil from being carried off by water.
If too much silt enters a stream it will literally smother the wild life there, especially fish.
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