TASK DEFINITION: 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.
PROBLEM: 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

SOLUTION: For a given medium, sound has a slower speed at lower temperatures.

PROBLEM: Question: If the Nile's flooding was prevented from covering the Egyptian bottomlands, it might ultimately result in _____ crops. 
 Answer: less

SOLUTION: As more water covered the land, sand and silt were washed in and covered the dead vegetation, enabling more and more plants to grow.

PROBLEM: Question: Milo was playing around with water by changing the pH level. If he lowered the pH what would happen to the acidity of the solution? 
 Answer: it would increase

SOLUTION:
Acids have pH values below 7. The lower the pH value, the more strongly acidic the substance.