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: If Mary is playing music in her room and the heater stops working, causing the temperature to fall, what happens to the speed of the soundwaves her radio is generating? 
 Answer: decreases

A: For a given medium, sound has a slower speed at lower temperatures.
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Q: Question: If the Nile's flooding was prevented from covering the Egyptian bottomlands, it might ultimately result in _____ crops. 
 Answer: less

A: As more water covered the land, sand and silt were washed in and covered the dead vegetation, enabling more and more plants to grow.
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Q: Question: What happens when you lighten a rocket? 
 Answer: goes higher

A:
By using multiple stages, empty fuel containers could drop away. This reduced the mass of the rocket so that it could fly higher.
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