Sunlight travels from the Sun to warm Earth. Boiling water in a pot warms a spoon inside the pot. A fire in a fireplace warms the air in a room. Cold water is heated in a microwave oven.
I gave my students this multiple choice question: Which event is an example of conduction?

Only one answer is correct among these 4 choices:
- Sunlight travels from the Sun to warm Earth.
- Boiling water in a pot warms a spoon inside the pot.
- A fire in a fireplace warms the air in a room.
- Cold water is heated in a microwave oven.

Could you tell me which one is correct?

Boiling water in a pot warms a spoon inside the pot.