Final answer:
Hot salty water will float on fresh water because saltwater is denser than freshwater due to the presence of dissolved salt ions.
Step-by-step explanation:
The statement is true - hot salty water will float on fresh water. This is because saltwater is denser than freshwater due to the presence of dissolved salt ions. The increased density of saltwater causes it to exert a greater downward force, which is balanced by the buoyant force from the freshwater. As a result, the saltwater floats on top of the freshwater.