Tsunamis are very long waves in the ocean, sometimes hundreds of miles long. They usually start suddenly as normal waves. Then they change to big waves very quickly. Once this change occurs, tsunami waves travel at great speed. They move across the ocean with little energy loss. Right before they hit land, the water will draw back from the coast. The water may pull back for many hundreds of feet. People who are unaware of the danger may be drawn by this strange site. Then the tsunami will hits. Tsunami's can remove sand from beaches, tear trees from the ground, and destroy whole towns. Tsunamis can be tremendously powerful.
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