Huge glacier calves off Greenland

The Petermann Glacier is a vast tongue of flowing ice in Greenland. In 2010 it calved - broke off a chunk - releasing an iceberg far larger than Manhattan Island in New York City. That huge chunk of ice moved into the ocean and eventually melted in the Atlantic (see Related Posts below for more on that event). And now Petermann has done it again. A crack appeared several years ago, and on July 16th conditions were right to allow a new chunk to break free: