One prediction of global warming is the melting of global...

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 lev- els? Why or why not?

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 lev-
els? Why or why not?

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Key Concepts

Sea Level Rise

Sea level rise refers to the increase in the average level of the world’s oceans, primarily caused by the melting of land-based ice and the thermal expansion of seawater as it warms. The melting of ice sheets on continents directly adds water to the ocean system, which can lead to coastal flooding and other significant environmental impacts.

Difference Between Floating and Land-Based Ice

The key difference is that floating ice, such as icebergs or ice cubes in water, is already displacing its weight in water, so melting does not alter the water level. However, ice that is land-based, such as ice sheets and glaciers, is not displacing any water when it is on land. When such ice melts, it adds additional water to the oceans, which can contribute to sea level rise.

Archimedes Principle

This principle states that a floating object displaces its own weight of the fluid it is in. When ice, which is less dense than water, floats in a liquid, it displaces exactly the weight of the ice. When the ice melts, it occupies the volume that was already displaced, meaning that for a floating piece of ice, the water level remains unchanged.

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