What causes ocean currents to form?

  1. Ocean currents form when cold water rises and warm water sinks.
  2. Ocean currents form in water when warm water rises and cold water sinks.
  3. The rising and sinking of water cannot cause ocean currents to form. Ocean currents form when cold water moves along the surface of the earth toward warmer water.
  4. The rising and sinking of water cannot cause ocean currents to form. Ocean currents form only when wind pushes the water.

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