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svetlana [45]
3 years ago
15

Why do they pressurize the cabin of airplane at 7,000 ft

Geography
1 answer:
n200080 [17]3 years ago
5 0
Hey there! 

Airplanes must be pressurized when flying at high altitudes so that the oxygen levels stay normal for us to breathe. The higher you go up, the thinner the air gets, which causes breathing problems for us humans. 

Thank you! 
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Why did some Black Loyalists choose to return to Africa?
kondor19780726 [428]

Answer:

A Black Loyalist was a person of African descent who sided with the Loyalists during the American Revolutionary War. In particular, the term refers to men who escaped the enslavement of Patriot masters and served on the Loyalist side because of the Crown's promises of freedom.

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3 years ago
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