Landslides are...?

Question

A. slow, flowing movements of soil
B. only caused by heavy rain
C. the rapid downhill movement of soil and rock
D.Caused by the collapse of limestone bedrock.

Answer 1

C

A landslide is a geological phenomenon which includes a wide range of ground movement, such as rock falls, deep failure of slopes and shallow debris flows.

Although gravity acting on an over steepened slope is the primary reason for a landslide, there are other contributing factors affecting the original slope stability:
-erosion by rivers, glaciers, or ocean waves create oversteepened slopes
-rock and soil slopes are weakened through saturation by snowmelt or heavy rains
-earthquakes create stresses that make weak slopes fail (see liquefaction, Hope Slide)
-volcanic eruptions produce loose ash deposits, heavy rain, and debris flows.
-vibrations from machinery, traffic, blasting and even thunder may trigger failure of weak slopes
-excess weight from accumulation of rain or snow, stockpiling of rock or ore, from waste piles, or from man-made structures may stress weak slopes to failure and other structures
groundwater pressure acting to destabilise the slope

Answer 2

To get all the information U may want or ever need go to these sites.
www.landslides.com
www.landslides.usgs.gov
www.landslide.com

The 2nd one is a real good site. I hope this helps U & answers Ur question.

Answer 3

The answer is "in your text book, look it up"!