Answer: Hot air is less dense than cool air; the heated air causes the balloon to rise simply because it is lighter than an equal volume of cold air. Buoyancy is an upward force that the air exerts, and it helps hot-air balloons and blimps stay in the air. A hot air balloon uses a burner to heat up the air inside the balloon.
Daniel o connell.........
Answer:
Yes.
Explanation:
Most deserts can get boiling hot during the day, but freezing at night.
I think the answer is D, I might be wrong though but hope I helped! Sorry if I didn't!
