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Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea. Out in the depths of the ocean, tsunami waves do not dramatically increase in height. But as the waves travel inland, they build up to higher and higher heights as the depth of the ocean decreases.
A tsunamis is a large ocean wave or series of waves that are structurally different from wind-driven waves. Tsunamis are trigger by some sort of underwater disturbance, usually from an earthquake, that displaces a large volume of water.