Which one of the following statements are correct?

(A) Ocean currents provide a high degree of regulation to the thermal environments of the earth‘s surface

(B) On a local scale, warm water currents bring moderating influence to coasts in arctic latitudes

(C) Cold currents are not able to bring down the temperature of tropical deserts

(D) Density differences may also cause flow of ocean water

Choose the correct answer from the options given below: