>>12762018 pb
"As glacial ice flows from land and spreads out over the sea, shelf areas farthest from shore grow thinner".
So, these things spread out from land and across the water. Is it hovering above the water or is it actually sitting in it? Of course, it's sitting in the fucking water. Not only is it's mass accounted for it's weight is also accounted for.
Go right now and take a tall glass and fill it with as much ice as you can possibly put in it. Now, fill it with water to the very brim. Not one more drop will fit in it without overflowing. Set it on the counter and come back in an hour or two and see if any of the water overflowed the glass from the ice melting. Let us know what you find.