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: Jimbo was playing on his sled one day. He slid down a snowy hill and then slid down a rocky hill. Which hill created less heat energy? 
 Answer: snowy hill
answer:
Friction causes the molecules on rubbing surfaces to move faster, so they have more heat energy.


question:
Question: Rocks that are buried very shallow are _____ than rocks on the surface. 
 Answer: newer
answer:
The main law is the law of superposition. This law states that deeper rock layers are older than layers closer to the surface.


question:
Question: Erin is trying to get her solution to have a pH as far from zero as possible. The best way for Erin to do that is to have the acidity of the solution 
 Answer: decrease
answer:

The more acidic a solution is, the closer its pH value will be to 0