The two correct answers that describe how water mixes in a thermohaline current are:
- Less salty water sinks under saltier water.
- Saltier water sinks under less salty water.
In thermohaline circulation, the density of water, which is affected by both temperature (thermo) and salinity (haline), determines how water mixes. Saltier water is denser and tends to sink, while less salty water is less dense and tends to rise.