di Riassunto sullo tsunami
Tsunami is a catastrophic wave. Tsunamis are generated by underwater movements. A tsunami is produced when part of the ocean floor is lifted by an earthquake and the column of water above it starts moving. The nearer it gets to land, the higher and more powerful it becomes. About 15 minutes before a tsunami hits, there is a giant vacuum effect. Most tsunamis happen within the Ring of Fire. Tsunamis are very dangerous, if people don't pay attention. If you think that a tsunami is going to hit you must go in the highest place you find.
