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Earth's Atmosphere - The Earth's Atmosphere Primary...

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The Earth’s Atmosphere
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Primary atmospheric gases are nitrogen, oxygen, and argon. The greenhouse gases, carbon dioxide, and water vapor are secondary constituents; 3.5% & 1.0%, respectively.
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Mesosphere: 50 km – 90 km. Almost all O 3 is depleted above 50 km; UV can not be absorbed and T decreases. Thermosphere: 90 km – 650 km. Heating increases due absorption of UV radiation by O and N atoms. Most of This layer is ionized: the lower thermosphere (90 – 300 km) comprises the ionosphere. The upper thermosphere is known as the exosphere. There are four principal layers to the Earth’s atmosphere. Troposphere: surface – 20 km. Most gas resides here. Because of condensation water is trapped in this layer. Heated from the surface, convection develops, which contributes to producing Earth’s weather patterns. Stratosphere: 20 km – 50 km. Contains the Ozone layer, which protects us from UV radiation. O 3 absorbs IR radiation, contributing to the increase in T with altitude.
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The Troposphere
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