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                   h.  A well-developed jet stream normally varies from 1,000 to 3,000 miles in length, 100
                       to 400 miles in width, and from 3,000 to 7,000 feet from top to bottom.

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                   i.  As air masses move away from their source regions and pass land and sea, they are
                       constantly being modified heating or cooling from below, rising or descending, or
                       gaining or losing moisture.

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