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.
--------
Question: Question: Air pressure is higher in the 
 Answer: valleys.

Answer: Air pressure is less at higher elevations.


Question: Question: By removing a pound of salt from a bucket of fresh water, could you cause the density of the water to 
 Answer: decrease?

Answer: Water density increases as salinity and pressure increase, or as temperature decreases.


Question: Question: Sue watches waves of different colored light travel past her with a spectrometer. The longer wavelengths cause _____ waves to travel past her than the longer wavelengths. 
 Answer: fewer

Answer:
This means that as wavelengths get shorter, more waves move past a particular spot in the same amount of time.