Start Date: End Date: Published Date Data Date
Nyamuragira and Nyiragongo
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Published December 10, 2007
In central Africa, in the Democratic Republic of the Congo, sit two volcanoes: Nyiragongo and Nyamuragira. Besides their proximity to Lake Kivu in the south, these volcanoes share the capacity for destruction, each having produced its share of catastrophic eruptions since the early twentieth century. Yet these volcanoes differ markedly from each other, one being a low-profiled structure rising subtly from the plain, and the other sporting steep slopes.
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Tornadoes Strike Northern Wisconsin
Published June 24, 2007
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Valley Forge, Pennsylvania
Published May 27, 2007
No battles were fought here, but it was still one of the most important landmarks of the American Revolution.
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Melt Ponds on Greenland’s Ice Cap
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Published April 7, 2007
Thinner than the 2.3-kilometer-thick center, the outer edges of the Greenland ice sheet develop melt zones like the one shown here during the warm summer months.
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Byrd Glacier, Antarctica
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Published April 1, 2007
The Byrd Glacier plunges through a deep, 15-mile-wide valley in the Transatlantic Mountains to create a 100-mile-long, rock-floored ice stream.
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Tarso Tousside Volcano, Northern Chad
Published March 18, 2007
The Tibesti Mountain Range in northern Chad is one of the world’s least-studied volcanic regions. A look at the area from space, however, must intrigue vulcanologists. One of the Tibesti Mountain’s features is Tarso Toussidé.
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Lake Khanka in Eastern Russia and China
Published February 18, 2007
At the juncture of the border between China and Russia sits Lake Khanka, also known as Lake Xinghai. Due to their importance to plant and animal species, the lake and the surrounding wetlands are protected by the Ramsar Convention, an international treaty for the protection and sustainable use of wetlands. Migratory birds that frequent this lake include several endangered species, such as the Japanese crane.
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Detailed View of Arctic Sea Ice
Published February 1, 2007
For many years, scientists have expected that climate change will be more rapid and dramatic at the poles than at lower latitudes, an expectation that has been demonstrated both with climate models and recent observations of snow and ice, surface temperatures, vegetation, and permafrost.
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