How does energy transfer from the hot water to the cold air

What element does susan b. anthony include in this passage to strengthen her argument?

Isolated volcanic peaks on the ocean floor are

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