Because the ocean has saltier water than a lake, a ship is less likely to sink due to the weight of the cargo it is carrying when it is in the ocean.
buoy: a floating object anchored at a specific location that serves as a guide or warning for mariners, marks the location of submerged objects, or moors boats instead of anchoring them. To identify channels and submerged hazards, two global buoyancy systems are used.
The dissolved salt increases the mass of the water and makes it denser than it would be without salt, as it does in ocean water. In salt water as opposed to fresh water, objects float better because they do so on a dense surface.
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