Yes, cold water is dencer indeed
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Sink. Items with a density of less than one will float on water.
if the substance of the element has greater density you can make it float by carving it out so weight over volume of the object is lighter in effective density
To float on water the object should have density less than that of water. But fork have density that is much more greater than that of water.Thus, a fork sinks in water.
All of the above? You can say the same thing in many ways. All of the following are different ways of saying the same thing, and all are correct: The marble sinks because the marble weighs more that an equivalent volume of water. The marble sinks because its density is greater than the density of water. The marble sinks because it has a greater mass than than same volume of water (and there is gravity/acceleration).
The ships are not made of solid iron. They contain much empty space where the cargo and or passengers go. So the overall density of a ship: its TOTAL mass divided by its TOTAL volume is less than that of water.