Whether the level of water in the glass rise falls or remains the same when the floating ice block in the glass melts.
The level of water in the glass falls when the floating ice block in the glass melts, as the volume of ice decreases as its melts.
Water exists in the universe in three different physical states, solid, liquid, and gas. The water expands as it freezes. Hence, one unit of frozen water has a larger volume than one unit of liquid water. When the water freezes, it occupies more volume and spreads widely.