yeah if you drop an ice cube in a glass of water sure but thats not whats happening here. the majority of ice is trapped above ground on the mountain ranges in Antarctica Mount Vinson is 16 000 feet above sea level with 100s of feet of ice. what do you think Antarctica is one big ice cube? theres tons of land and mountains separating ice from water. when ice melts it receeds, meaning its going to start with the ice shelves then move inward to the ice on land and trapped in mountains.