Vertical Ocean Currents Are Generated by

Vertical ocean currents are generated by

A) cold and dense ocean water sinking and warm and less-dense water rising
B) warm and dense ocean water sinking and cold and less-dense water rising
C) cold and dense ocean water rising and warm and less-dense water sinking
D) less dense water rising and cold but dense water sinking
E) None of these answers are correct because there are no vertical ocean currents.