A tsunami is caused by a sudden movement on the ocean floor. The sudden movement can be caused by an Earthquake, or by a volcano erupting, or an underwater landslide. Tsunamis can also be caused by moving plate tectonics. Tsunamis travel across the ocean at a big speed level and it becomes into large deadly waves. One of the worst tsunamis’ that has happened in US history was in Lituya Bay, Alaska on July 9, 1958. The height of the tsunami was 1720 feet, the Alaska Panhandle loosened about 400 million cubic yards. The tsunami that happened in Lituya Bay, Alaska was so deadly that it killed more than 100 people.

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