The differing densities of water create a consistent movement between the various thermal layers. As water is cooled, it actually expands, so it rises, and as it is warmed it sinks.
ocean currents are caused by difference in temperatures and salinity lol :) :P hehe
Deep-ocean currents are affected by wind, temperature and earths rotation.
differences in temperature and salinity.
Air currents are caused by the sun's uneven heating of the earth, Water Currents (mostly known as Ocean Currents) are generated by wind, density differs in water masses causes by temperature and salinity variations,gravity, and also events such as earthquakes
Deep ocean currents are caused by differences in saltiness or water temperature.
global winds and differences in temperature and salinity.
Cold water currents are currents which flow deep along the ocean floor. Cold water currents can cause temperature changes which in return can have a major impact on the overall climate of the Earth.
Temperature, density, and salinity of water
The large amount of solids dissolved in ocean water, which is the salinity, makes it more dense than fresh water. Cold water is denser than warm water (temperature). These differences in density produce convection currents
The correct answer is differences in temperature *and* differences in salinity between the tropic and polar regions. However in the tropic regions the currents are started by the prevailing winds. And in the polar region the more saline and therefore, denser waters in the current sink to the bottom, which of course is caused by gravity.
Air pressure
The relationship between the density of ocean water and the formation of deep currents. Differences in the temperature and salinity and the resulting differences in density cause variations in the movement of deep currents. For example, the deepest current, the Antarctic Bottom Water, is denser than the North Atlantic Deep Water. Both currents spread out across the ocean floor as they flow toward each other. Because less dense water always flows on top of denser water, the North Atlantic Deep Water flows on top of the Antarctic Bottom Water when the currents meet. Any other suggestions for questions? E-mail ncmulkey@bellsouth.net