A tsunami is a series of water waves caused by earthquakes and volcanic eruptions, landslides, glacier calving, meteorite impacts, etc. Tsunami waves have much longer wave length compared to normal sea waves, with periods ranging from minutes to hours, and wave heights of tens of meters. In case that tsunami reaches coastal areas, it can be enormously destructive. World deadliest tsunami occurred in 2004 in Indian Ocean with over 230,000 people death in 14 countries.
Source: Wikipedia
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