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: Keith is showering, and is washing himself using a bar of soap, and then again with a loofah. Keith's skin will get better exfoliation, due to the greater friction, when he washes his body using the 
 Answer: loofah
[A]: Friction is greater when objects have rougher surfaces or are heavier so they press together with greater force.


[Q]: Question: Carlos knows that there is less ozone in the stratosphere, and goes out on a sunny day. He puts on sunscreen knowing that the UV rays can reach the ground 
 Answer: more
[A]: With less ozone in the stratosphere, more UV rays reach the ground.


[Q]: Question: Dan is swimming deeper and deeper into water. The water the deeper he goes will be 
 Answer: older
[A]:
Deeper aquifers typically contain older 'fossil water.'