Which of the following is a cause of soil compaction?
a. an increase in the amount of organic matter
b. the use of equipment on dry soil
c. the use of heavy equipment
d. all of the above

It's C the use of heavy equipment

Option (c) is the correct answer.

Explanation:

When pore space between the soil particles are reduced by pressing or by providing pressure over them is known as soil compaction.

The porosity of soil can be decreased with help of increasing weight on mineral grains on overlying sediment or by mechanical means.

Thus, we can conclude that the use of heavy equipment is a cause of soil compaction.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: