 | Jet streams are currents of fast moving air found in the upper levels of the atmosphere S. the two Jet Streams that affect us are the Polar Jet Stream and the Subtropical Jet Stream. The Polar Jet separates the cold Arctic air from warmer air and the Subtropical Jet separates tropical air from the Equator from cooler air 74.27 Kb.  1 | read |
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| An age of expansionism boundless america Atlantic, the Pacific, Canada, and Mexico. How “natural” and firm, how predestined those boundaries seem today! If we are to understand the almost obsessive desire of earlier Americans to expand their boundaries 19.74 Kb. 1 | read |
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