A tsunami is a series of powerful ocean waves that is usually caused by an earthquake under the sea. When t sea fl suddenly mo, it pus a hu amount o water upw. In de water, t waves m be less than a meter high, so ships often do not notice them. As they approach the coast, however, the waves slow down and grow much taller. Before a tsunami arrives, the sea sometimes pulls back from the shore, which can be a warning sign.

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