Question

4. When a block of material moves downslope along a curved surface, the type of mass movement is called _____. (1 point)

Answer 1

We call that a "slump."

It's where a huge pile of earth moves down a "concave upward" slope.

Look at this picture:
http://mathsfirst.massey.ac.nz/Calculus/Sign2ndDer/images/ConcaveUpDown.png

In order to get into the RED part (going from LEFT to RIGHT),
a pile of earth would to move down a concave-upward slope.