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Mesopause

Holt Earth Science Chapter 17, Section 17.1

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Environmental Science
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Atmosphere of Earth
Meteorology
Atmospheric thermodynamics
Atmosphere
Physical geography
Nature
Stratosphere
Troposphere
Tropopause
Thermosphere
Mesopause
Mesosphere

Vertical Structure of the Atmosphere A. Pressure Changes Atmospheric Pressure: weight of the air above - at sea level, the avg. pressure ~ 1000 millibars (mb), or ~ 1 kg/cm2 Pressure at higher altitudes is less ? of the atmosphere is below 5.6 km (3.5 mi); at 16 km (10 mi), 90% of the atmosphere has been passed, and > 100 km (62 mi), only 0.00003 % of all gases in the atmosphere remain. Rest of atmosphere merges with space vacuum. B. Temperature Changes Near Earth?s surface, air temperature drops with an increase of height. I. Troposphere (air ?turns over?) Lowermost atmosphere layer (we live in here); temperature decreases with an altitude increase. All important weather occurs here.
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