Jade Iceberg, Antarctica. When seawater at depths of more than 1,200 feet freezes to the underside of massive ice shelves, it forms ‘marine ice.’ Enormous hunks of ice break off from the ice shelf, creating icebergs. When one of these icebergs overturns, its jade underside is revealed. The wondrous color of this ‘marine ice’ results from organic matter dissolved in the seawater at those great depths. Green icebergs are infrequently seen because their verdant bellies are underwater
