Which term is best defined as heat transfer that occurs when warm particles move in currents? a. evaporation b. convection c. conduction d. radiation

The answer is B. Convection occurs when hot/warm water rise to the top and the cold water  goes to the bottom in a vessel. This is because hot/warm water is less dense than cold water. Additionally, convection currents are well perceptible in air and water and fluid substances that are poor conductors of heat

Ithink it’s a forms a perfect sphere or a smooth flattened oval