A parcel of air at the surface is heated which expands the air and increases the parcel's volume. If the same number of air molecules occupy the greater volume, density decreases. The increase in volume results in lower pressure. What will happen to the air surrounding this parcel?
A. Less dense air flows in to replace the rising air.
B. Denser air flows in to replace the rising air.
C. More dense air rises at the surface.
D. Less dense air sinks at the surface.
Answer: B
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