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: If Milo is measuring the seafloor and he notices the level of spreading has increased, what will happen to the sea level? 
 Answer: it will rise
Sea level rises if an increase in seafloor spreading rate buoys up the ocean crust, causing the ocean basin to become smaller.

Question: Air pressure is higher in the 
 Answer: valleys.
Air pressure is less at higher elevations.

Question: If Milo decreases the number of crests of his wave, what happens to the frequency of his wave? 
 Answer: decreases

Wave frequency can be measured by counting the number of crests or compressions that pass the point in 1 second or other time period. The higher the number is, the greater is the frequency of the wave.