“Perhaps I’m not a scientist but doesn’t ice expand when it’s frozen and then takes up less volume when it melts, if that’s true why wouldn’t ocean levels go down instead of up if that glacier melts”
1. If the ice is floating it displaces the exact same amount of water as contained in the ice so melting would not reduce sea levels.
2. It is a glacier, not an iceberg. As it melts, it adds mass to the oceans.
But, if it’s a glacier and not and iceberg, how is ocean eater “rushing” beneath it?