Which of the following is true about Jet streams?

1. Forecast weather
2. Reduce flight time
3. Increase precipitation
4. All of the above.

Calm region in the centre of the cyclone:

1. focus
2. eye
3. core
4. All of the above.

Your uncle was puzzled because his flight from Delhi to London was more than 9½ hours long but his return from London was about 8½ hours. As a student of geography how would you explain this to him?

1. The pressure gradient supported the return flight.
2. Flying along a jet stream reduces flight time.
3. The Coriolis Force deflects air reducing flight time.
4. None of the above.

Name the four main pressure belts of the earth.