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A(n) __________ is a fast-flowing river of air at the boundary between the troposphere and stratosphere.

User TheMisir
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This is the jet stream. This air current flows from west to east along a typically-meandering path that is often used as a predictor of weather conditions. These currents are typically formed from the fact that the equator is warmer than the poles, and this allows the different-density air masses to develop an eastward-moving component.
User Awelkie
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