If it breaks off, it will float.......
If it breaks off, it will:
1) no longer be supported by land.
2) be driven into warmer waters where it will melt.
Land ice entering the ocean increases the amount of water in the ocean.
3) It WILL cool the ocean, therby cooling the planet, triggering a new ice age.
Back in the 1970s they were promising us a new ice age. They swore that in just a couple of decades, Cleveland would be buried under hundreds of feet of ice.