Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Runoff is precipitation that flows over the surface of the land. This water may travel to a river, lake, or ocean. Runoff may pick up fertilizer and other pollutants and deliver them to a water body. In this way, runoff may pollute bodies of water. Answer: runoff
What term describes precipitation that flows over the surface of the land?