| Assertion [A]: The polar front theory states that masses of relatively, warm and cold air arc brought into contact. |
| Reason [R]: These masses are known after their source regions. |
A) Both A and R are correct and R is the correct explanation of A.
B) Both A and R are correct, but R is not the correct explanation of A.
C) A is true, but R is false.
D) R is true, but A is false.
Correct Answer: B
Solution :
The well-known Polar-front theory was described by the Bergen school early 20th century. The theory explains the formation, development and life cycles of cyclones. In short several stages of cyclone development can separately be identified. The polar front arises as a result of cold polar air meeting warm tropical air. It is a stationary front as the air masses are not moving against each other. Off the coast of eastern North America, especially in winter, there is a sharp temperature gradient between the snow- covered land and the warm offshore currents.
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