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ANSWERS: 4
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I don't think there is a definite size where one becomes the other, but a submarine is always a boat, no matter what size it is.
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Boat is called a ship when it is required to have a lifeboat, instead of just life jackets.
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The definition that I know is that a ship is capable of crossing an ocean. A boat is a vessel that is not typically capable of crossing an ocean. Submarines traditionally are called boats because initially they were carried on ships for transit across an ocean.
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http://en.wikipedia.org/wiki/Boat http://en.wikipedia.org/wiki/Ship
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