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: When we lower the temperature of water it becomes 
 Answer: more dense
[EX A]: When a volume of water is cooled, the molecules move less vigorously, so same number of molecules takes up less space and the water is denser.

[EX Q]: Question: Eric rubs together tissue paper and then sandpaper. The rougher tissue paper has _____ friction than the sandpaper. 
 Answer: more
[EX A]: Rougher surfaces have more friction between them than smoother surfaces.

[EX Q]: Question: Eric noticed that diffusion was occurring slowly in a medium. This medium has particles that are 
 Answer: further apart
[EX A]:
This means the rate of diffusion is much slower in liquids than in gases, because the particles of a gas are further apart and collide much less.