Question

in nature, hot air tends to rise and cool air tends to sink. this is behind the concept of convection heating that is used in ovens. convection currents occur only in fluids such as liquids and gases but not in solids. which of the examples below is an example of convection? a rubbing your hands together. b heating a fish tank. c basking in the sun. d striking a match.

Explanation:

Convection is heat transfer in fluids. Rubbing hands is friction - related, basking in the sun is radiation, striking a match is chemical - to - thermal. Heating a fish tank involves heat transfer in water (a fluid) through convection currents.

Answer:

B. heating a fish tank