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   ocr: Why do boats stay upright? A boat that has not been over- filled may still sink: in rough waters if the crew. stows its cargo all on one side of the ship or. stacks it too high. UNSTABLEI CARGO This ship carries only a small cargo, buti iti is stacked high above the deck and to one side of the ship. In calm seas the boat: may stay upright, but the slightest wave will make it capsize (roll over). STABLE CARGO The boat would be much safer if its cargo were arranged like this. As the cargo is in the center of the boat and near the boat's bottom, it's much more difficult to roll the boat over. You ...