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 Jim lowers the temperature of water in his bathtub, what happens to the density of the water? 
 Answer: increases
[A]: Water becomes more dense when it is colder and when it has more salt.


[Q]: Question: Jim is performing experiments in his lab. If he applies less heat to gas inside of a beaker, what happens to the gas particles? 
 Answer: move slower
[A]: If the gas is heated, the particles will move faster as they gain more energy.


[Q]: Question: Water falling down a tall mountain will move 
 Answer: faster
[A]:
Water flowing over a steeper slope moves faster and causes more erosion.