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Activity 3B-Cold Salty Deep Unit-3 Hydrosphere Glossary Unit Activity Vocabulary Word Hydrosphere Ocean Conveyor Belt Density Hydrosphere Ocean Conveyor Belt Ocean current Hydrosphere Ocean Conveyor Belt Thermohaline Definition The calculated mass per unit volume of a substance. Less dense fluids and gases float on more dense fluids and gases unless they mix. Hot air is less dense than cold air, which is why hot air balloon rise. A continuous and directed movement of the oceans water due to winds, waves, temperature, density or the movement of the Earth. Thermo = heat haline = salinity. The thermohaline circulation of the oceans refers to the deep water current that is driven by cold dense salty water and warm surface waters.
