Ocean currents
- Forces driving currents: solar heating, winds, gravity, Coriolis force; density differences
- Warm and cold currents; surface and deep currents; gyres
- Atlantic currents
- Pacific currents
- Indian ocean currents
- Equatorial currents and the equatorial counter-current in the doldrums
- Effects: climate moderation, fishing grounds where warm and cold currents meet, fog, western tropical oceans warmer than eastern
- Thermohaline circulation