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An umbrella tends to move upwards on a windy day principally because

A) trapped air under the umbrella, warms, and rises.
B) buoyancy increases with increasing wind speed.
C) air pressure is reduced over the curved top surface.
D) all of the above

Marked as best answer by toya4me

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Answer: C

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This is awesome you took your the time to answer these questions. You have been so helpful.