Question

which statements represent convection? select two options. black asphalt gets very hot on a sunny day. the movement of air in a hot - air balloon makes it rise into the sky. a dark sand beach can burn the soles of your feet. a spoon gets warm from sitting in a soup pot. a house has high heating bills because the heat ends up in the attic. a house loses heat through an exterior wall.

Explanation:

1. Convection is heat transfer by fluid (liquid/gas) movement.

• "The movement of air in a hot - air balloon..." : Hot air (less dense) rises, cold air (more dense) sinks, causing air movement (convection) that lifts the balloon.
• "A house has high heating bills..." : Warm air (less dense) rises to the attic (convection - heat transfer via air movement).
• Other options: "Black asphalt..." and "dark sand beach..." are radiation (sun's heat absorbed). "Spoon in soup" is conduction (heat through direct contact). "Heat through wall" is conduction (or radiation, not convection).

Answer:

B. The movement of air in a hot - air balloon makes it rise into the sky.
E. A house has high heating bills because the heat ends up in the attic.