If the streams of ice are separated by exposed topography, such as a mountain divide, the streams are called outlet glaciers. If the streams of ice are not separated by topography, but their edges touch, they are called ice streams. An ice tongue extending across the sea surface. The ice is channeled through the valley in the distance. Photograph compliments of John B. Anderson, Rice University.
Ice tongues are narrow, long, floating ice features.
Drygalski Ice Tongue is the largest on the continent. Icebergs Iceberg surrounded by sea ice in Ross Sea. Photograph courtesy of Charlotte Kelchner, Rice University. Icebergs are pieces of floating ice that break off, or calve , from ice shelves, ice tongues, and the edges of ice sheets. The form and size of icebergs varies tremendously.