Multiple choice

The circulation of ocean water occurs

  1. only laterally

  2. only vertically

  3. both laterally and vertically

  4. neither laterally nor vertically
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ocean water moves both horizontally through surface currents driven by wind and density differences, and vertically through upwelling and downwelling processes. This complex circulation system includes thermohaline circulation that moves water between surface and deep ocean layers.

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