What is true about Rossby waves? Choose the correct answer from the options given below:

1.Rossby waves are meandering rivers of air.

2.There are two to four waves in each hemisphere.

3.They are formed by major relief barriers such as the Rockies and the Andes.

4.They are formed by thermal differences and uneven land sea interfaces.

A1, 3 and 4 Only

B1, 2 and 4 Only

C1, 2 and 3 Only

D2, 3 and 4 Only

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