A landslide is a rapid flow of soil or snow racing down a slope of a mountain or a hill. It can be formed from either natural or human activity. A landslide can mix with air and water as it descends, causing the air to be unbreathable and water to be muddy. Powerful landslides have the capability to catch ice, rocks, trees, and other objects on the slope. Landslides are caused by disturbances in the stability of a slope, or rapid temperature change. They can be caused by heavy rains or droughts, earthquakes or volcanic eruptions. Mudslides develop when there is a high water level in the ground which results in a surge of water-saturated rock, earth, and debris. Mudslides can be activated by natural disasters. Some areas are more likely to experience landslides or mudflows, such as areas where wildfires or human modification of the land have destroyed vegetation, Areas where landslides have occurred before, Steep slopes and areas at the bottom of slopes or canyons, Slopes that have been altered for construction of buildings and roads, Channels along a stream or river, and
Areas that have constant water flow when it rains. Different types of landslides include fall, Topple, slide and flow. These types of landslides are described below:
Falls are landslides that involve the collapse of material from a cliff or steep slope. Falls usually involve a mixture of free fall through the air, bouncing or rolling. A fall type landslide results in the collection of rock or debris near the base of a slope.
Topples are landslides that involve the forward rotation and movement of a mass of rock, earth or debris from a slope.
A slide type landslide is a down-slope movement of material that occurs along a surface. If the surface is straight then it is called translational or planar. If the surface is curved the slide is called a rotational.
Flows are landslides that involve the movement of material down a slope in the form of a fluid such as a mudslide.