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.

[EX Q]: Question: If Mona is building a machine to help her vacuum her floor and she decreases the amount of force the engine inside the vacuum, what happens to the vacuum ability to make work easier? 
 Answer: decreases
[EX A]: Machines make work easier by increasing the amount of force that is applied, increasing the distance over which the force is applied, or changing the direction in which the force is applied.

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

[EX Q]: Question: If Mona is adding chemicals to her swimming pool before the start of the summer and she lowers the pH number of the water, what happens to the acidity of the swimming pool? 
 Answer: increases
[EX A]:
Lower pH numbers are more acidic and higher numbers are less acidic (also called more alkaline).