You will be given a definition of a task first, then some input of the task.
In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Question: What natural process allows water to return again to the earth’s surface? Answer: precipitation
Output:
Precipitation are a natural process that allows water to return again to the earth’s surface.