Which of the following describes how water mixes in a thermohaline current

Question

Cold water sinks under warmer water
Less salty water sinks under saltier water
Warm water sinks under cooler water
Saltier water sinks under less salty water

Answer 1

The correct description of how water mixes in a thermohaline current is:

Saltier water sinks under less salty water.

In thermohaline circulation, variations in temperature (thermo) and salinity (haline) create differences in water density, causing denser, saltier water to sink and less dense, fresher water to rise.