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: Milo was moving some metal balls around. If he were to move the balls closer together, what would happen to the force of gravity? 
 Answer: increase
Example Output: Objects that are closer together have a stronger force of gravity.

Example Input: Question: If North America is larger then Asia, which continent experiences less trash buildup? 
 Answer: Asia
Example Output: The Southern Hemisphere has less trash buildup in the oceans because less of the region is continent.

Example Input: Question: When a river gets full of a lot of waste chemicals it becomes 
 Answer: dirtier
Example Output:
More pollutants mean poorer air quality.