The cacophony of breaking waves is a distant rumble.

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For a few minutes we sat there quietly, listening to the waves breaking.

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We had to turn into the wind to get to him which meant we had waves breaking through the lifeboat.

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And then sounds of people relaxing, lovers relaxing on the beach and talking to one another and the sound of the wind blowing and the sea gulls and the waves breaking.

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They found that gravity waves "break" on the surfaces of planes, just like ocean waves breaking on the beach, causing much of the turbulence that occurs out of the blue in clear air.

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"Waves were breaking out on the blue see, " Heyerdahl later wrote.

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They wanted to body surf where the waves were breaking.

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These waves can travel up to 180 miles (300 kilometers) before breaking, said Robert Sharman, a meteorologist at the National Center for Atmospheric Research (NCAR), who conducted the study.

MSN: Blame gravity waves for turbulence - Technology & science - Science - LiveScience | NBC News