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A Landslide is the movement of rock, earth, or debris down a sloped section of land. The biggest reason for a landslide is always that there is a slope and material goes down the slope because of gravitym Landslides can occur underwater, called a submarine landslide, coastal and onshore environments.

Landslides have three major causes : geology, morphology, and human activitym Geology refers to characterictics of the material itself. The earth or rock might be weak or fractured, or different layers may have different strengths and stiffness. Morphology refers to the structure of the land. For example, slopes that lose their vegetation to fire or drought are more vulnerable to landslides. Vegetation holds soil in place, and without the root systems of trees, bushes, and other plants, the land is more likely to slide away. A classic morphological cause of landslides is erosion, or weakening of earth due to water. Human activity, such as agriculture and construction, can increase the risk of a landslide. Irrigation, deforestation, excavation, and water leakage are some of the common activities that can help destabilize, or weaken, a slope. Landslides cause property damage, injury and death and adversely affect a variety of resources.

There are many ways to describe a landslide :
• Landslide Movement
There are several ways of describing how a landslide moves. These include flow, topple, slump, slide, creep, and fall.

• Landslide Material
A landslide can involve rock, soil, vegetation, water, or some combination of all these. A landslide caused by a volcano can also contain hot volcanic ash and lava from the eruption. A landslide high in the mountains may have snow and snowmelt.

• Speed Of The Movement
This ranges from very slow creep (millimetres / year) to extremely rapid (metres / second). Some landslides include toxic gases from deep in the Earth expelled by volcanoes. Some landslides, called mudslides, contain a high amount of water and move very quickly. Complex landslides consist of a combination of different material or movement types.


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