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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.
Large waves produced by earthquakes are known as tsunamis. Define: Tsunami - A very large and destructive wave, generally caused by a tremendous disturbance in the ocean, suâ¦ch as an undersea earthquake or volcanic eruption.