Howstuffworks "Stratosphere - Encyclopedia Entry"

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Stratosphere

Stratosphere is a layer of Earth's atmosphere. It lies above the troposphere, the atmospheric layer nearest Earth. The stratosphere begins about 6 miles (10 kilometers) above Earth's surface in the polar regions and about 12 miles (19 kilometers) near the equator. The upper boundary, called the stratopause, lies at an altitude of about 30 miles (48 kilometers).

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