A view of the glacier taken Tuesday. Inside the square: the iceberg that broke off. NASA Earth Observatory hide caption toggle caption NASA Earth Observatory The Two-Way Iceberg Twice The Size Of Manhattan Breaks Off Glacier In Greenland July 18, 2012 The same glacier "calved" another huge iceberg in 2010. Greenland is changing quickly, experts warn. Melting there will put more upward pressure on sea levels.