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In Japanese, the word “tsunami” means “harbor wave.”

Tsunamis are massive waves of water commonly caused by an earthquake or volcanic eruption.

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Tsunamis can travel at destructive speeds of around 500 miles an hour. They don’t lose their energy; in fact, they can travel across entire oceans with little energy loss.

If caught by a tsunami wave, don’t swim! Grab a floating object and let the current carry you.

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