For this question, look at the hydrologic cycle diagram.

which number represents runoff on this diagram?

a) 1
b) 2
c) 3
d) 4

The correct answer is D) 4.

Runoff is one of the event that occurs during water cycle. During runoff water flows over land as surface instead of being absorbed into the ground. Runoff may be the part of rain, melting of snow or water by irrigation water and amount of runoff depends on vegetation, use of land and amount of nutrients in the soil.