Which of the following is true of the surface water and deep water of the ocean?
A. There is constant vertical mixing between layers because the warm water is atop the colder water.
B. There is little vertical mixing between layers because the warm water is atop the colder water.
C. There is constant vertical mixing as fresh water evaporates and the salty surface water that remains sinks.
D. There is little vertical mixing between layers because currents only flow sideways.