The ice of Argentina's Upsala Glacier appears almost neon blue.
A small valley glacier exiting the Devon Island Ice Cap in Nunavut, Canada.
Argentina's Upsala Glacier in Los Glaciares National Park has experienced rapid retreat.
Perito Moreno Glacier
Argentina's Perito Moreno Glacier is the third-largest reservoir of freshwater in the world.
Perito Moreno Elevation
The cracks and crevices of Argentina's Perito Moreno Glacier illustrate the slow movement of the ice.
Digging Into a Glacier
Researchers dig a 13-foot (4 meter) pit into the snow of the Devon Island Ice Cap in Nunavut, Canada to examine annual snow layers.
Watching a Glacier
A time-lapse camera keeps an eye on Nunavut, Canada's Belcher Glacier. Ground observations help researchers understand how much ice is calving into the ocean.
An aerial view of Nunavut, Canada's Sverdrup Glacier, which flows from the Devon Island Ice Cap to the ocean.
Meltwater ponded at the Columbia Glacier in Alaska, as seen in July 2008.
Crevasses in the accumulation zone of the Columbia Glacier in Alaska. The accumulation zone is the area of the glacier where snow accumulates and packs into ice.