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I reposted this because Ayana posted it on another student's thread.

When the air under the envelope is heated, the balloon lifts. Which of the following statements is true?
A. Hot air balloons use radiation to rise.
B. Hot air balloons use conduction to rise.
C. Hot air balloons use convection to rise.
D.Hot air balloons use air resistance to rise.
(thank you ^^)

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posted by Ayana
today at 4:04pm

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