Hey there!
Airplanes must be pressurized when flying at high altitudes so that the oxygen levels stay normal for us to breathe. The higher you go up, the thinner the air gets, which causes breathing problems for us humans.
Thank you!
I think it's erosion. If we're talking about geology.
Im going to go with Margin.
Answer:
a prolonged period of abnormally low rainfall, leading to a shortage of water.
"the cause of Europe's recent droughts"
Explanation:
Hope this was helpful :)
