# 1เลือกประเภทWhich of the following gases is found in the largest amount of the air?ArgonOxygenNitrogenCarbon dioxide
# 2เลือกประเภทWhich atmospheric layer are you in when taking an airplane?MesosphereTroposphereThermosphereStratosphere
# 3เลือกประเภทIn which atmospheric layer does air turbulence occur all the time?MesosphereTroposphereStratosphereThermosphere
# 4เลือกประเภทWhich atmospheric layer is beneficial to long-distance communication?MesosphereTroposphereStartosphereThermosphere