Q. Consider the following factors:
1. Rotation of the Earth
2. Air pressure and wind
3. Density of ocean water
4. Revolution of the Earth
Which of the above factors influence the ocean currents?

[A] 1 and 2only

[B] 1,2 and 3 only

[C] 1 and 4 only

[D] 2, 3 and 4 only

Answer: B
Notes:
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