GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Jet streams. Artwork showing the paths of the jet streams around the globe. Jet streams are fast flowing high-altitude narrow air currents that circle the Earth. The major ones on Earth are the polar jet stream (7-12 km altitude, blue) and the subtropical jet stream (10-16 km altitude, red), which occur in both hemispheres. The direction of rotation of the Earth's axis is also shown (top centre).
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