which is an example of convection currents?\no marshmallows toasting over a campfire\no a pot being heated…

Brief Explanations:

Convection currents involve the movement of a fluid (liquid or gas) due to differences in temperature. A radiator emitting warm air and drawing in cool air creates a circulation of air, which is an example of convection. Toasting marshmallows over a camp - fire is radiation (transfer of heat by electromagnetic waves). A pot being heated by an electric burner is conduction (heat transfer through direct contact). Feet getting hot when stepping across sand is also conduction.

Answer:

a radiator emitting warm air and drawing in cool air