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Stratosphere

Definition:

The highly stratified region of the atmosphere above the troposphere extending from about 10 km (ranging from 9 km in high latitudes to 16 km in the tropics on average) to about 50 km.

Source: Climate Change Glossary

More:
Stratoshphere
Layers of the atmosphere

Source: based on Harcourt School publishers 

Among other gazes, the stratosphere contains small amounts of gaseous ozone (O3), which filters out about 99 percent of the incoming harmful ultraviolet (UV) radiation. Most commercial airline flights operate at a cruising altitude in the lower stratosphere.

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Related words:

Atmosphere - Stratosphere

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