An increase in ocean surface temperature causes the density of ocean water might change.
Explanation:
The density of the ocean's waters is dependent on temperatures. The lower the temperature the higher the density and vice versa. Therefore, when the ocean surface becomes warmer due to global warming so will the density of the waters becomes lighter. Warmer ocean waters mean the ocean level rise because the polar ice caps melt. The severity of storms also increases as the oceans feed more energy to storms.
