1) Avalanche 2) Landslide 3) Rockslide 4) Slide 1) Mudslide 2) Rockslide 
• (n.) Alt. of Landslide
Landslip is the slipping or sliding of a considerable tract of land or earth from a higher to a lower level. Landslips are due to a variety of causes, chiefly the decay of supporting strata, or excessive saturation of the soil by rain. Among the more disastrous occurrences of this kind are the slip of the Rossberg Mountain behind the Rigi in Switze...
mass-movement where rock material (often clay) slips down slope along a defined slip surface (often gently curved).