weather balloon - item sent into the atmosphere with meteorological equipment , jet stream - current of air found almost 7 miles up in the atmosphere, troposphere - lowest layer of atmosphere, stratosphere - second layer of atmosphere, tropopause - where the troposphere meets the stratosphere, 100-200 mph - speed of jet stream, Mt. Everest - summit reaches into the jet stream, rotation of Earth - causes winds to move from west to east, 1939 - year in which term "jet stream" was first used,

The Jet Stream

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