Which is one of the most dramatic triggers of sudden mass movements? a) revegetation b) an earthquake c) gravity d) a drainpipe

B) an earthquake

Explanation:

An earthquake is one of the most dramatic triggers of sudden mass movements.

From the choices given, an earthquake is the most correct solution.

An earthquake  is one of the most dramatic triggers of sudden mass movements.

Explanation:

Mass movement is the term used for the down slope of Earth's surface particles that are loose by the gravitational force without any help of a medium such as water or ice or even wind. The most sudden and dramatic type is an earthquake.

The instability is the cause of all the following effects and these effects are most sudden and dangerous. Drainage pipes aid in reducing the mass wasting. There will be destruction of foundations and harm will be caused to people and animals in case these sudden movements are severe.  

answer; (d) melting of sea ice;