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Earth's atmosphere is comprised of layers of gases that are retained by the earth's gravity.

There are 5 main layers:

exosphere - outermost layer

stratosphere thermosphere mesosphere

troposphere - begins at earth's surface and extends to between 7 km of the earth's poles at the equator with some variation due to weather.

There are layers within these layers:

ozone - within the stratosphere

ionosphere - ionized by solar radiation

homosphere and heterosphere - determined by whether or not the gases are well mixed (not that there's anything wrong with that

Planetary boundary layer - part of the troposphere nearest the earth's surface

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Q: Describe the extent and structure of the atmosphere?
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