Which statement BEST describes why warm ocean currents are usually surface currents?
A) Warm water is less dense than cold water.
B) Ocean tides bring warm water to the surface.
C) Warm water contains more salt than cold water.
D) Ocean water loses heat to the air at the surface.
The answer is A because the less dense the water is the more closer to the surface it will be and when heated by the sun, it increases the temperature of surface currents.
