Why do the oceans have currents?
A map showing the various ocean currents on the earth.
| Photo Credit: Public domain
A: The earth formed as a molten world. Around 4 billion years ago, its surface cooled enough for water vapour to condense. Torrential rains then fell for centuries, filling basins to create the first oceans around 3.8 billion years ago.
Once liquid water covered large parts of the surface, three forces set it in motion.
Published – April 08, 2026 08:45 am IST
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