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A tsunami is a wave in the sea that floods the coast. The cause of a tsunami is usually an earthquake, but the cause may be a volcanic eruption, submarine landslide or meteorite impact. Due to the sudden movement of a large quantity of water, a wave may be generated with a large wavelength that can travel hundreds, or even thousands of kilometers around the globe.

The shoaling of the sea at the coast causes the wavelength to decrease, but increasing the height. A tsunami can be tens of meters high. A tsunami can penetrate the land many kilometers, and cause great damage.

Around the Pacific ocean tsunamis are most common, because of the active volcanism. In other oceans and seas tsunamis have been described also.

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