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: A scientist sees that some galaxies are closer together than before, so they know that the universe's expansion is 
 Answer: less

A: As the Universe expands, galaxies move further and further apart.
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Q: Question: Compared to a one inch ripple in a pond, would a 350 foot tall ocean tsunami have 
 Answer: more energy

A: Bigger waves have more energy.
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Q: Question: When a river gets emptied of a lot of waste chemicals it becomes 
 Answer: cleaner

A:
More pollutants mean poorer air quality.
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