Any boat, ship, barge or floating object will float at different levels depending on the warmth and/or consistency of the water its floating in/on.
If a ship loaded to capacity in, say.., Greenland at a salt water port/harbour and sailed to a fresh water port/harbour in the tropics, there would be risk of it riding too low in the water at its destination and the risk of it sinking.
Also known as a Plimsoll mark, the Plimsoll line was introduced in 1876 in England due mainly to the work of t...
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