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Prince Olav Coast, Antarctica
11.21.07 -- Ice fringes the coast of Antarctica, but not all of that ice looks or acts the same. This cloud-free view of East Antarctica's Prince Olav Coast shows a few types of ice along Antarctica's coast. NASA's Terra satellite captured the image on Nov. 12, 2007.
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Layered Ice Deposits Near North Pole of Mars
09.20.07 -- This false-color image of the north polar layered ice deposits on Mars taken on Sept. 20, 2007, by the Mars Reconnaissance Orbiter has been processed to emphasize color variations. Some of the color variations may be caused by small amounts of water frost on the surface, or they may be due to variations in dust composition within the layered deposits.
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Petermann Glacier, Greenland
08.30.07 -- Seasonal changes in Greenland ice sheets during summertime are apparent in this image of the Petermann Glacier, located in the far northwestern part of the island.
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Northwest Passage Nearly Open
08.28.07 -- Explorers have sought a Northwest Passage for centuries, meeting with disappointment and tragedy each time. Even now, navigating from the Atlantic to the Pacific through Canada's Arctic Islands has been difficult. The summer of 2007, however, saw sufficient sea ice retreat to change the character of the fabled sea route.
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Summer Thaw, Eastern Greenland
07.19.07 -- Summer thaw was underway on the fringe of eastern Greenland when the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite passed overhead and captured this image on July 13, 2007.
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Volcanic Ash on Slopes of Karymsky
06.17.07 -- Of the volcanic products that linger on the land, most of us think of hardened lava flows, but volcanic ash can also persist on the landscape. One example of that persistence appeared on Siberia's Kamchatka Peninsula in spring 2007.
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Iceberg A22A, South Atlantic Ocean
06.16.07 -- These Space Station astronaut photographs capture the remains of a giant iceberg that broke off Antarctica in 2002. The iceberg was photographed on May 30 about a third of the distance from South America towards Cape Town, South Africa.
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Melting Ice Reveals New Island off Greenland
06.03.07 -- Long connected to Greenland's coast by ice, this tiny island escaped recognition for what it was for nearly a century. The island was only identified in September 2005, by Dennis Schmitt, an explorer from Berkeley, Calif. Melting ice enabled Schmitt to detect the island while flying over northwestern Greenland.
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Large Area of Antarctica Melted, Re-Froze in 2005
05.31.07 -- The interior of Antarctica has generally appeared to be staying well below freezing. In May 2007, however, a team of researchers found evidence of warming and melting as much as 900 kilometers (500 miles) inland.
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Glacial Retreat
05.15.07 -- Perhaps the most visible sign that Earth's climate is warming is the gradual shrinking of its glaciers. In the past 125 years, the Athabasca Glacier, the most visited glacier in North America, has lost half of its volume and receded more than 1.5 kilometers.

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