Photos: Melting glacier uncovers island

Many scientists believe the amount of summer melting of snow in Greenland is considered an indicator of global change resulting from global warming.

The top four images show summer melting over a 5-day period. Blue and white represent surfaces which are cold and dry, while red and black show melting snow. his figure compares the melting observed over 15 days during July 1999 in Greenland. The red areas around the central blue and white areas are the main melt zones. In the lower group, white identifies where the most rapid changes are taking place.