Q: What is caused by differences in density at the top and bottom of the ocean?


Read this paragraph and choose the correct option from the provided answers:

Currents also flow deep below the surface of the ocean. Deep currents are caused by differences in density at the top and bottom. More dense water takes up less space than less dense water. It has the same mass but less volume. Water that is more dense sinks. Less dense water rises. What can make water more dense?.

 Choices:

- shallow currents

- still water

- flat currents

- deep currents


A:
deep currents