instruction:
In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
question:
Question: Willard dug up a rock from near the surface, and realized it was _____. 
 Answer: young
answer:
Therefore, deeper rock layers must be older than layers closer to the surface.


question:
Question: A _____ in the population cold lead to less food availability. 
 Answer: increase
answer:
As the population increases, the food supply, or the supply of another necessary resource, may decrease.


question:
Question: William sees that a country is shrinking rapidly. Will there be more or less availability of water in the future? 
 Answer: more
answer:

The availability of water is projected to get worse as demand increases.