Giant Vanishing Ice

Captured Moment
Icebergs break off, or calve, from the Dawes Glacier at the end of Endicott Arm in southeast Alaska. The tallest known iceberg in the North Atlantic was about 551 feet above sea level, making it the height of a 55-story building. Despite their size, icebergs can move an average of about 10 miles a day.

• The Arctic