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: Ian is digging in his garden, and admires the shiny pebbles sitting in the yard, as he digs a hole and finds more rocks, he knows that the first ones he found are 
 Answer: younger
Older rocks are at the bottom and younger rocks are at the top.

Question: If we half our use of nonrenewable resources, we will end up having _____ of them. 
 Answer: more
Using less nonrenewable resources means that they will last longer.

Question: If you mixed salt water and regular water which would sink? 
 Answer: salt water

Water density increases as salinity and pressure increase, or as temperature decreases.