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Lake Janisjarvi Impact Crater
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Published April 6, 2008
Lake Jänisjärvi is a roughly oval-shaped lake, some 13 by 17 kilometers (8 by 11 miles) across, in northwestern Russia, near the Finnish border. The basin for this lake was formed hundreds of millions of years ago by a meteorite impact.
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Nicholson Crater, Canada
Published March 23, 2008
Some 400 million years ago, a meteor struck Earth in what is now Canada’s Northwest Territories. The 12.5-kilometer- (7.8-mile-) wide crater is now Nicholson Lake, one of many small lakes that dot the sub-arctic, glacier-scoured landscape.
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Pingualuit Crater, Canada
Published February 10, 2008
Pingualuit Crater holds a lake about 267 meters (876 feet) deep. Because this lake has no connection to any other water body, inflows from other lakes cannot contaminate Pingualuit’s sediments.
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Island in the Sky, Canyonlands National Park
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Published January 3, 2008
This park in Utah encompasses some of the most remote and rugged terrain in the continental United States.
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Nyamuragira and Nyiragongo
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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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
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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