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Only the ice that is above sea level can cause the sea level to rise. If the ice is below sea level and it melts, the resulting water volume is less than the original ice volume (that's why ice floats) and that would cause the sea level to drop.If it's all below sea level how is that going to cause a rise of 5 feet in global sea level?
Yes, I see your point, but I was only talking about how ice and water volumes change and affect sea level. When an iceberg is in isostatic equilibrium with the ocean around it, the mass of ice that is below the sea level is about 90% of the total ice mass, and the mass above sea level is about 10% of the total mass. However, the volume of the ice below sea level also represents the entire volume of the meltwater, once all the ice has melted. The ice above sea level does not add to that total volume, but it does add to the mass.Easy, this ice is not floating, but anchored on land, if molten, sea water will enter to the previous submarine level, but all ice above, kilometres of it, will flow once thawed. Not?
It sounds like the canyon is already filled with Ice from the existing glaciers, thus it's swapping out the ice the water. The volume of water 92% smaller then Ice, but the glaciers extend well above sea-level.If it's all below sea level how is that going to cause a rise of 5 feet in global sea level?