In Japanese, the word “tsunami” means “harbor wave.”
Videos by Rare
Tsunamis are massive waves of water commonly caused by an earthquake or volcanic eruption.
RELATED: Five facts about hurricanes that might surprise you
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.