Jet streams are found in the tropopause, which is the boundary between the troposphere and the stratosphere. They form here because this is where the greatest pressure and temperature differences between the cold polar air and warm tropical air exist. These “rivers of air” flow at high speeds, steering weather systems across the globe. ANSWER: (D) In the tropopause
Where are jet streams usually found? (A) In the mesosphere (B) In the ionosphere (C) In the ozonosphere (D) In the tropopause
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The tropopause acts as a “ceiling” for the Earth’s weather and it is at this very ceiling that the Jet Streams race. These narrow bands of wind, which can reach speeds of over 400 km/h, occur because of the sharp thermal contrast between the atmospheric “cells.” Because the tropopause is higher at the equator and lower at the poles, a steep pressure gradient is created in the upper air. The Coriolis force then turns this air into the fast-moving Westerly winds that pilots use to shorten flight times and that meteorologists use to predict storm tracks.
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