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CNN – Most of us can say we've experienced some type of turbulence on a flight.

But what causes it and what do pilots do to combat the threat? CNN's Jennifer Gray took a look at the science behind turbulence.

Nothing could have prepared the passengers on United Flight 1676 – a nightmare at 34,000, high above the Rocky Mountains.

The plane, which was carrying 114 passengers and five crew members, encountered severe turbulence, so strong it plunged.

According to the latest numbers from the FAA, 329 people were injured due to turbulence between 2002 and 2011. So, what's the science behind turbulence, and is there anything that can be done to avoid it?

Watch the video above for the answer.