7. which of the following best illustrates a natural process acting as a constructive force?
a) wind depositing sand to build up sand dunes.
b) a glacier weathering a mountainside.
c) a river eroding soil during a flood.
d) acid rain breaking down the surface of a rock.

A) Wind depositing sand to build up sand dunes.

The Earth is changing all the time, although sometimes it is difficult to notice it because of the slow pace in which changes occur.

In geography, constructive forces are those that build new land. The main constructive forces are crustal deformation, volcanic eruptions and deposition of sediment. This question is an example of deposition of sediment.