The two correct answers that describe how water mixes in a thermohaline current are:
- Saltier water sinks under less salty water.
- Cold water sinks under warmer water.
Thermohaline currents are driven by differences in temperature (thermo) and salinity (haline) of water. Saltier, colder water tends to be denser and sinks, while warmer, less salty water is less dense and rises.