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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.
An earthquake is a shift of a block of the Earth's crust. A tsunami is a water wave generated by underwater disturbances such an earthquake, a landslide, or perhaps a comet or an asteroid. Other underwater disturbances can also generate tsunami.