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physical science

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a weather balloon filled with gas is released and rises into the atmosphere. as it rises, the balloon__.
a) gets smaller because air pressure outside the balloon increases
b) gets smaller because gas pressure inside the balloon decreases
c) doesnt change size
d)gets larger because gas pressure inside increases and air pressure outside decreases
e) gets larger because the gas pressure inside stays the same while outside air pressure decreases

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    What do you think and why?

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