Question

which is an example of convection currents?
marshmallows toasting over a campfire
a pot being heated by an electric burner
feet getting hot when stepping across sand
a radiator emitting warm air and drawing in cool air

Explanation:

• Convection currents involve the movement of fluids (liquids or gases) due to temperature differences.
• When a radiator emits warm air, the warm air (less dense) rises and cool air (more dense) moves in to replace it, creating a convection current.
• Marshmallows toasting over a campfire is mainly radiation (heat transfer in the form of 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