Which of the following does not represent an impact of recreational activity on springs?
a. destruction of native vegetation
b. wildlife disruption
c. decreased soil erosion
d. water pollution

The correct answer is - c. decreased soil erosion.

The decreased soil erosion can not be seen as a negative impact, on contrary, it is a very positive impact. Soil erosion, most often, comes as a result of the destruction of the trees and shrubs at certain place, but since it is decreasing, it means that not that the vegetation is not destroyed and the terrain cleared from it, but it is actually increasing, thus holding the soil tighter and making it more stable, and as an end result, the erosion is decreasing.