Cornell’s guide suggested that the iceberg had recently flipped. Icebergs form when chunks of freshwater ice calve—or break off—from glaciers and ice shelves, as well as other icebergs. Because of the varying densities of ice and saltwater, only about 10 percent of an iceberg will ever show at the surface, and that protruding tip will gather dirt and snow. Melting can trigger calving, but it can also change the equilibrium of an iceberg, causing it to flip… More at Smithsonian.
That is beautiful.