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The biggest detriment to keeping deserts green is of course water. With rainfall in the desert limited, afforestation is a tricky and potentially dangerous thing to do. China tried this for decades with afforestation efforts, planting billions of trees in steppe regions of China and Mongolia, only to later worsen because the trees consumed too much ground ...


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There are two water-related erosional process at work here: The exhumation of main sandstone blocks caused by heavy rainfall, incising channels and carrying away the loose debris for deposition elsewhere as "sand". Formation of weather resistant surfaces caused by dissolution and re-precipation of iron-rich minerals. You often see this process ...


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