A hot air balloon pilot wants the balloon to quickly rise several feet higher so it will be above some trees in the distance. Which best explains how the pilot can make the balloon rise?

Heating the air inside the balloon makes it expand and become less dense than the cooler surrounding air. The denser outside air then provides an upward buoyant force, causing the balloon to rise. Making the inside air equal in temperature or density to the surrounding air would not create the needed lift, and cooler air inside would make the balloon less buoyant.

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