Start Date: End Date: Published Date Data Date
Nicholson Crater, Canada
540 x 405 JPEG
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.
Related images:
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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
540 x 540 JPEG
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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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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