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Mass wasting is the movement of the weathered materials down slope due to gravitational forces accompanied by rain action. Mass wasting also known as slope movement or mass movement. Mass wasting has a number of effects which include the following:

1. Formation of scars and bare land: When a large mass of soil moves, such as it occurs in landslide, the process leaves behind a large portion of eroded, bare and unproductive land. This land is often not easily colonized by plants, a fact which stimulates further erosion on the bare scar. Scars are very common on slopes of mountains such as mounts Kilimanjaro, Kenya and Rwenzori.

2. Soil erosion: When mass movement takes place, the load often removes almost all the vegetation on its way. This exposes the land to agents of erosion such as wind, animals, water, ice, waves, etc. Also the place from which the material has been removed forms a scar upon which water, ice and other agents of erosion can act and remove the soil, further leading to gullies, depressions and gorges.

3. Formation of new landforms: The materials removed and transported to a distant location may form hills at their destination and form scars and depressions at the place of origin.

4. Formation of lakes: Materials of landslide can block ariver bedand valley, preventing downward movement of water. The blocked water accumulates on the upper side of a river valley to form a lake. Examples of such lakes include Lake Bujukuin theRwenzori Mountains, Nyabihoho in Uganda and Funduziin South Africa. Lake San Cristobal in Colorado, USA, was formed when mudflow dammed (blocked) a river in the San Juan Mountains.

5. Diversion of a river course: The landslide material can block the natural river bed, forcing the river to divert and form a new route. This makes the river leave its usual flowing course, and form a new course. The direction of flow of the river is thus changed. This happened in the Rif Atlas Mountains of Morocco in 1963 when a mudflow pushed the course of RiverRhesana100 metres to the east.

6. Formation of a fertile soil: If the removed material comes from a fertile land, it can form a fertile soil at the place of destination, where fertile soil never existed, and encourage agricultural activities to take place.

7. Damage to property: Different categories of landslides may cause various damages to property and can adversely affect other resources. The effects of landslide are dangerous because they destroy everything in their path. Roads are blocked, hampering traffic flow. Homes, buildings and other infrastructures are destroyed. The water mains, sewers and power transmission lines are disrupted. Oil and gas production and transportation facilities are ruined. Farms are also destroyed by various forms of mass wasting.

8. Loss of life: The more populations expand and occupy more and more of the land surface, mass movement processes become more likely to affect humans.

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