On the given political map of the world, the following geographical features have been marked as A, B, C, D, E, F and G. Identify these features with the help of the following information and write their correct names.
- A. A major sea-port
- B. A major air-port
- C. A major shipping canal
- D. A major area of subsistence gathering
- E. A major area of nomadic herding
- F. A major area of commercial livestock rearing
- G. A major area of extensive commercial grain farming