Tsunamis are ocean waves caused by a change in the basic form of a sudden the sea and this can be caused by earthquakes, volcanic eruptions, or landslides. Tsunamis can also be caused by volcanic activity beneath the ocean surface. Tsunami comes from the Japanese language which means "waves of the ocean waves." Earthquakes, large movements in the basic and the sea surface, volcanic eruptions, and various kinds of eruptions under the sea can cause a tsunami. Tsunamis can occur if there is a vertical displacement at the meeting of two plates of the earth.