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.

Input: Consider Input: Question: Fred found a longitudinal wave. The particles are getting further apart. The amplitude is 
 Answer: decreasing

Output: The closer together the particles in a longitudinal wave are, the greater the amplitude.


Input: Consider Input: Question: When we get to the bottom of a mountain the air is 
 Answer: more dense

Output: At higher elevations, there is less air to press on a given area.


Input: Consider Input: Question: If Mona is heating up popcorn in the microwave and the popcorn begins to move faster, what happens to the temperature of the kernels? 
 Answer: increase


Output: When particles move more slowly, temperature is lower and an object feels cooler.