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Altitude range: 0-12 km. Characteristics: Contains most of Earth's weather; temperature decreases with altitude; contains the highest concentration of water vapor; air is well mixed.

Altitude range: 85-600 km. Characteristics: Temperature increases with altitude; contains the ionosphere which reflects radio waves; Northern and Southern Lights occur in this layer; air density is very low.

Altitude range: Above 600 km. Characteristics: Outermost layer; air is extremely thin and composed mainly of hydrogen and helium; satellites orbit Earth within this layer; the boundary between Earth's atmosphere and outer space.

Altitude range: 12-50 km. Characteristics: Contains the ozone layer which absorbs and scatters ultraviolet solar radiation; temperature increases with altitude due to ozone absorption of UV radiation; jet aircraft fly in this layer.