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:

Convection is the transfer of heat through the movement of fluids (liquids or gases). The movement of air in a hot - air balloon (as hot air is less dense and rises) and the heat loss through an exterior wall (where air currents can be involved in heat transfer) are examples of convection. A house having high heating bills because heat ends up in the attic is also related to convection (hot air rising). A spoon getting warm from sitting in a soup pot is conduction (heat transfer through direct contact). A dark sand beach burning feet is due to radiation (absorption of solar radiation). Black asphalt getting hot is also radiation (absorption of sunlight).

Answer:

A house loses heat through an exterior wall.
The movement of air in a hot - air balloon makes it rise into the sky.