question: What are particular problems for aircraft in the atmosphere?
choices.text: transportation clog airways extremely low humidity volcanic clouds feedback mechanisms negative feedback gas spreads in the air very complex
choices.label: A B C D E F G H
fact2: Ash clouds are a particular problem for aircraft.
combinedfact: Volcanic clouds in the atmosphere is a particular problem for aircraft.
formatted_question: What are particular problems for aircraft in the atmosphere? (A) transportation (B) clog airways (C) extremely low humidity (D) volcanic clouds (E) feedback mechanisms (F) negative feedback (G) gas spreads in the air (H) very complex