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Atmosphere

The part of t...

Question

The part of the atmosphere above the 90 km from the earth is called ________.

A

homosphere

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B

heterosphere

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C

ozone layer

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D

mesosphere

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Solution

The correct option is B heterosphere
The heterosphere is the upper portion of the Earth's atmosphere, in which gases are fractionated according to their molecular weight. It lies above the homosphere, where chemical constituents are well mixed. On average the heterosphere begins at an altitude of about 80 km.

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