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.

Example Input: Question: Rick had a rock (Rock A) from 1000 feet beneath the crust's surface. He later dug 3000 feet deeper and got a second rock (Rock B). Which rock is likely older? 
 Answer: Rock B
Example Output: Older rocks are at the bottom and younger rocks are at the top.

Example Input: Question: If Australia is smaller then Asia, which country will produce more of a trash buildup in the oceans? 
 Answer: China
Example Output: The Southern Hemisphere has less trash buildup in the oceans because less of the region is continent.

Example Input: Question: If Mona creates a longitudinal wave and decreases the distance of the particles in the wave, what happens to the amplitude of that wave? 
 Answer: decreases
Example Output:
The closer together the particles in a longitudinal wave are, the greater the amplitude.