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: Willard dug up a rock from near the surface, and realized it was _____. 
 Answer: young
Therefore, deeper rock layers must be older than layers closer to the surface.

Question: Will has a pully with 5 rope segments. Alan's pully has an equal size rope with 7 segments. Which person needs less force to do the same job? 
 Answer: Alan
The more rope segments on a pully that are helping to do the lifting work, the less force that is needed for the job.

Question: If Mona is creating an acid and she makes it stronger, what happens to the amount of hydrogen ions that acid can produce? 
 Answer: increases

A stronger acid produces more hydrogen ions than a weaker acid.