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In this picture you can see the problem. Many people have said that it stands to reason that the roots hold everything together so remove the vegetation and everything falls apart. Well it is true that vegetation does stop erosion, soil erosion. But if you click on the picture you will see clearly just what the roots have been doing to this slab of rock. The root on the side has forced part of the slab to split, moving a section upwards. Had the tree continued to grow the root would have got bigger lifting the rock more and more and allowing rain in. A bit of frost and the crack would have got even bigger.The root at the top is also lifting a section of rock away from the main slab. Not as big but big enough to make a dent in anyone's head.Multiply this small slab of rock by a hundred and you begin to get an idea of the scale of the problem.
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