Two children were waiting at Mumbai airport for the arrival of their cousin when it was announced that all flights from Delhi were delayed due to fog at Delhi. What is fog and why does it disrupt air traffic?
a. Fog is light showers of rain and it is difficult to fly through rain.
b. Fog is a cloud near the ground and it is difficult to see through a cloud.
c. Fog is the smoke from the aircraft exhaust and it is difficult to see in smoke.
d. Fog is strong wind blowing from the mountains and it is difficult to fly in the wind.