Concept:Convection is heat transfer through the actual movement of heated fluid particles.
It mainly occurs in liquids and gases, not in solids.
Explanation:Stone and wood are solids, so they transfer heat only by conduction.
Mercury is a liquid, but it is a metal and conducts heat readily, so it is not the typical substance for convection.
Water is a liquid and a poor conductor of heat.
When water is heated, the warmer parts expand, become less dense, and rise, while cooler parts sink.
This continuous circulation is known as a convection current.
Therefore, convection will take place in water among the listed substances.
Answer:D. Water