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.

[EX Q]: Question: If you were to launch a cannon which ball would fly faster if everything else were the same? 
 Answer: Lighter
[EX A]: The mass of the particles: lighter particles will diffuse faster, because on average they move faster.

[EX Q]: Question: Derek is diving into the ocean. The pressure at the surface will be light, and the pressure the deeper he goes will be 
 Answer: stronger
[EX A]: Pressure: Pressure increases with depth, but increased pressure raises the melting temperature, so melting of rock is less likely to occur at higher pressures.

[EX Q]: Question: John was looking at the rocks, and noticed something. The less the metamorphism in the rock, the difficulty to tell what it was 
 Answer: Decreased
[EX A]:
The more extreme the amount of metamorphism, the more difficult it is to tell what the original rock was.