Figure 14.17: Thermohaline currents are created by differences in density due to temperature
(thermo) and salinity (haline). The dark arrows are deep currents and the light ones are
surface currents. ( 20 )
Figure 14.18: Surface and deep currents together form convection currents that circulate
water from one place to another and back again. A water particle in the convection cycle
can take 1600 years to complete the cycle. ( 10 )