Humid erosion covers the entire scope of sculpturing effects of running water from the action of rainwater to that of the rivers. Mass movements of earth and weathered materials on hill-slopes down to valley are mainly due to the lubricating action of water which allows a mass of materials to move under gravity. This is particular acute where the slopes are steep. The slow movement of soil down a hill, slope is call soil-creep. A more sudden movement due to the lubricating effect or rain water may cause widespread landslides. In mountainous districts where the roads and railway tracks are cut through steep-sided valleys landslides may obstruct railway lines, cut off road communications and even bury villages and people.
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