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UPSC Prelims 2012 · World Geography · Oceans, Seas and Straits
Consider the following factors: Which of the above factors influences ocean currents?
- Rotation of the Earth
- Air pressure and wind
- Density of ocean water
- Revolution of the Earth
- (a) 1 and 2 only
- (b) 1, 2 and 3
- (c) 1 and 4
- (d) 2, 3 and 4
Show the answer and explanation
Answer: (b) 1, 2 and 3
Rotation, winds and density shape currents.
Statement by statement
1. ✓ YES Rotation (Coriolis) deflects currents.
2. ✓ YES Winds push surface water.
3. ✓ YES Density differences drive deep currents.
4. ✗ NO Earth’s revolution doesn’t drive currents.
Why the others are wrong
(a) Drops density.
(c) Adds revolution.
(d) Adds revolution and drops rotation.
The trap
Rotation and revolution — only rotation matters here.
🔒 Currents: winds, Coriolis, density (thermohaline), coastline shape.
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