What is a landslide?
A landslide is the downslope movement of rock, soil or debris under gravity.
Formation, concepts and processes
Rain saturation, earthquakes, erosion and excavation can destabilize slopes. Movement ranges from slow creep to sudden rockfalls. A steep slope alone does not prove a landslide will occur; geology and water matter.
Examples, applications and limits
Cracks, leaning poles and new seepage may be warning signs, but not all failures show them. Follow local warnings and obtain geotechnical assessment in risk areas. Planting trees alone will not stop every deep-seated slide.
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