Violent turbulence: What causes it

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http://i.cbc.ca/1.2179876.1382507118!/httpImage/image.jpg_gen/derivatives/16x9_460/horizon-cp-w2048134.jpg Turbulence is a common occurrence during air travel. While it can be frightening or nauseating for some travellers, it's usually as routine as the in-flight movie.


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