surname, attested from late 12c., probably meaning bald head; cf. Wyclif Stye up, ballard, where Coverdale translates Come vp here thou balde heade [2 Kg.2:23-24, where God kills 42 children for making fun of Elijah's lack of hair.]
A slump is a form of mass wasting that occurs when a coherent mass of loosely consolidated materials or rock layers moves a short distance down a slope. Movement is characterized by sliding along a concave-upward or planar surface. Comments.
Landslides occur when the slope changes from a stable to an unstable condition. 1  A change in the stability of a slope can be caused by a number of factors, acting together or alone. Natural causes of landslides include: 2  groundwater (pore water) pressure acting to destabilize the slope.