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In the deep water of the open ocean, tsunamis are hundreds of miles long an only a few feet high. So they aren't even noticeable at this point. When a tsunami reaches the shallower water near shore it slows down. Since the front slows down first, the back catches up, causing the wave to essentially pile up on itself. Now it comes in as a large, violent surge of water which can easily wreck boats.

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Q: Why are tsunamis more dangerous for docked boats than for boats in the open ocean?
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