Delware is smaller than King County in Washington State , much hyperbole about nothing ..    the iceberg (like all "Sea" Ice) is floating in water.....  even if were all to melt at once sea level wouldn't rise as 90% of ice is blelow water and is already displacing water and when Ice is formed it expands (engine blocks , crack, bottled water frozen expands in your freezer) so when ice melts there is less mass.......