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Questions about Hot Air Balloons
Are hot air balloons a contributor to air pollution?
Do hot air balloons work better in cold weather?
Do hot air balloons show up on radar?
How high can hot-air balloons fly?
What are the interesting facts about hot-air balloons?
Do hot air balloons have practical applications?
Can hot air balloons fly in cold weather?
Why weren't hot air balloons invented earlier?
How are hot air balloons protected from birds popping them?
Are hot air balloons safe to operate?
What are hot air balloons made out of in China?
Why are burners used inside hot air balloons?
How do hot air balloons fly?
How high do hot air balloons fly?