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.
Q: Question: John was looking at rocks in the valley and noticed something. The less resistant the rocks he looked at were, the amount they remained was 
 Answer: Shorter
A: 
Different types of rocks weather at different rates. More resistant types of rocks will remain longer.