Which of the following situations is not an example of natural erosion?
a.
winds hollow out rocks in moab, utah.
b.
agriculture in nebraska changes the local landscape.
c.
the pacific ocean erodes the west coastline of california.
d.
the nile river creates the nile delta where it meets the mediterranean sea.

The correct answer is - B. Agriculture in Nebraska changes the local landscape.

The agriculture is not a natural process, but it is a human activity. The human kind started to perform agriculture during the Neolithic period, and since than has been contributing to large scale erosion and change in the appearance of the landscape all around the world.

The agriculture contributes in multiple ways for an increased erosion. The plowing, is good for the crops, but it loosens the soil, thus making it more vulnerable to erosion. The irrigation contributes to erosion with the water taking the surface layers away from their original position. And also, the pesticides are damaging the soil, destroying its natural structure, and make it easy to erode.

the correct answer is c