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: By removing a pound of salt from a bucket of fresh water, could you cause the density of the water to 
 Answer: decrease?
[A]: Water density increases as salinity and pressure increase, or as temperature decreases.


[Q]: Question: Jeff heated the pot of boiling water. What happens to the dissolved oxygen contained within the water? 
 Answer: it decreases
[A]: Warm water cant hold as much dissolved oxygen as cool water, so an increase in the temperature of water decreases the amount of oxygen it contains.


[Q]: Question: Lana is watching two waterfalls. The first waterfall is very steep, and the other is just a slope. The waterfall which will have the least erosion at the bottom is the one with the water which falls 
 Answer: slower
[A]:
Water flowing over a steeper slope moves faster and causes more erosion.