Question

4 in the image below, the arrows in the water are showing heat transfer through– a conduction. b convection. c radiation. d direct contact

Explanation:

The arrows show circular movement of water: heated water rises, cools, then sinks to be reheated. This circular heat transfer via fluid movement is convection. Conduction is heat transfer through direct particle contact without bulk movement, radiation is heat via electromagnetic waves, and direct contact refers to conduction, not this fluid circulation.

Answer:

B. convection.