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Troposphere
- contains 75% of the atmosphere mass.
- contains almost all of its water, vapor and aerosol
- this is where friction with the Earth's surface influences air flow
- Day to day weather occurs here
- air in the troposphere is heated from ground
<b>Mesosphere
- Greek for middle
- Millions of meteors burn up daily
- Noctilorent clouds located here
- Atmospheric tides occur in this region
- average temp -9degC, 30 mile to 54 miles