One prediction of global warming is the melting of global ice, which may result in coastal flooding. A criticism of this prediction is that the melting of icebergs does not increase ocean levels any more than the melting of ice in a glass of water increases the level of liquid in the glass.
(a) Is this a valid criticism? Does the melting of an ice cube in a cup of water raise the level of the liquid in the cup? Why or why not?
A response to this criticism is that scientists are not worried about rising ocean levels due to melting icebergs; rather, scientists are worried about rising ocean levels due to melting ice sheets that sit on the continent of Antarctica.
(b) Would the melting of the ice sheets increase ocean levels? Why or why not?
Here, we are going to explain if melting of an ice cube in a cup of water raise the level of liquid.
Melting of ice cube in a cup of water does not raise the level of the liquid in the cup.
According to Archimedes’ principle, when a body is immersed fully or partially in a fluid, it displaces a volume of water equal to its weight.
Since, the floating ice cubes displaces exactly its weight in water, when it melts, the volume of water obtained takes the same volume that the ice cube displaced in the water. That is why, the water level remains the same.