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Upheaval Dome, Utah
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Published July 23, 2007
Upheaval Dome is a striking geologic structure in the Canyonlands National Park of southern Utah. The alternating rock layers make a nearly circular, 5.5-kilometer- (3.4-mile-) diameter “bull’s-eye.” This photograph of Upheaval Dome was taken by an astronaut onboard the International Space Station. The oblique viewing angle—in other words, not looking straight down—provides a sense of the topography within and around the structure. The dome appears more like an ellipse than a circle due to the oblique viewing perspective.
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Patuxent River Naval Air Station, Maryland
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Published July 2, 2007
Maryland’s Patuxent River Naval Air Station is located on a small peninsula, bordered by the Patuxent River to the north-northeast and Chesapeake Bay to the east and southeast. International Space Station crews frequently use the Patuxent River Naval Air Station as a geographic reference point and photographic training target. This astronaut photograph illustrates why—the distinctive pattern of the airfield runways and the station’s location in Chesapeake Bay make it easy to spot from orbit.
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Grey Glacier, Chile
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Published June 25, 2007
The Southern Patagonian Icefield of Chile and Argentina hosts several spectacular glaciers—including Grey Glacier located in the Torres del Paine National Park in Chile. This glacier, which in 1996 had a measured total area of 270 square kilometers and a length of 28 kilometers (104 square miles in area, 17 miles long), begins in the Patagonian Andes Mountains to the west and terminates in three distinct lobes into Grey Lake (upper image).
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Iceberg A22A, South Atlantic Ocean
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Published June 18, 2007
The iceberg A22A was photographed when it was about a third of the distance from South America towards Cape Town, South Africa. A22A is one of the largest icebergs to drift as far north as 50 degrees south latitude, bringing it beneath the daylight path of the International Space Station (ISS). A series of parallel lines can be seen in the lower image. These are probably “hummocks,” dunes of snow that have solidified, and they date back to the time when the iceberg was connected to Antarctica. A developing fracture in the ice can be seen in the lower, detailed view.
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Southern Everglades National Park, Florida
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Published June 11, 2007
Everglades National Park in southern Florida is the largest subtropical wilderness in the United States. Known as the “river of grass,” the Everglades wetlands and wooded uplands host a variety of endangered species including crocodiles, manatees, and panthers.
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Den Helder, Netherlands
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Published June 4, 2007
The city and harbor of Den Helder in the northern Netherlands has been the home port of the Dutch Royal Navy for over 175 years. The location provides access to the North Sea, which has made it an important commercial and strategic port. Bright red agricultural fields to the south of Den Helder indicate another noteworthy aspect of the region—commercial farming of tulips and hyacinth.
Concepcion Volcano, Nicaragua
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Published May 29, 2007
Concepción Volcano is one of the tallest and most active of Nicaragua’s volcanoes. The 1,610-meter (5,280-foot), cone-shaped volcano is the northern half of dumbbell-shaped Isla de Ometepe. To the northwest of the crater, a very faint plume (probably steam) creeps like fog down the mountain, blurring the sharp gullies that carve the volcano’s flanks.
Monteregian Hills, Quebec, Canada
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Published May 28, 2007
This astronaut photograph of the area to the east of Montreal, Canada, captures two striking patterns. The circular features are the central members of a group of unusual rock formations known as the Monteregian Hills: Mont St. Hilaire, Rougemont, and Mont Yamaska. The rectangular pattern blanketing the landscape in the background reveals the intensive agriculture in the fertile lowlands in southern Quebec.
Springtime Comes to the Niagara River
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Published May 21, 2007
The eastern end of Lake Erie is clogged with ice that is pushed against the shoreline by the prevailing westerly wind. The ice collects in Lake Erie, and the Lake Erie-Niagara River Ice Boom prevents it from flowing down the Niagara River, which is the international boundary between the Canadian Province of Ontario, and New York State. A boom is deployed each December. Operational since 1964, the boom serves several functions: it protects the water intakes for the Niagara River power plants, and it minimizes ice runs (large blocks of ice flowing downstream as ice breaks up in the spring) and blockages that can create damage and flooding along the river.
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