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For the most part, AS the ice cube melts, NOTHING happens to the
level of the water. The melted ice, which previously DISPLACED its
weight in water simply BECOMES its weight in water. But, at some
particular instant, enough ice has melted so that the lead shot
suddenly drops from the ice cube. The remaining ice, relieved of its
weighty burden, quickly pops upward as a result of the (now) excess
buoyant force. The water level drops as surrounding water rushes in
to fill the void.