Dean wants to use shallow pans, water and adjustable lamps to make a model that compares how sunlight affects the ocean at Earth’s equator and its poles. How should he design his model?

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures