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ve. For more than 40 years, the USGS has been keeping a comprehensive and impartial register of the planet's land surface. These fascinating and colorful satellite images enable scientists to address global environmental issues such as those raised at the recent United Nations World Summit on Sustainable Development. Check out: http://earthshots.usgs.gov for comparative satellite images of environmental change, including deforestation of the Amazon rainforest. Closer to home, these USGS images aid experts in the study of national water, energy and environmental resource issues. The archive includes more than 28,000 gigabytes of data from the Advanced Very High Resolution Radiometer (AVHRR) carried aboard NOAA polar orbiting weather satellites and more than 880,000 declassified intelligence satellite photographs. Check out the register at: http://edc.usgs.gov/archive/nslrsda/overview.html Jon Campbell (joncampbell@usgs.gov) 703-648-4460

BIG Ice Cubes and Plenty of Water
As Alaska's Hubbard Glacier - North America's largest tidewater glacier - advanced, it ruptured the dam formed by the slow advance of the glacier, unleashing a torrential flood of fast-moving water and large chunks of ice and debris that was the second largest glacial lake outburst worldwide in historic times. At its peak discharge, the glacial outburst's rate of flow was 30 times greater than the peak historic flow on the Mississippi River at Baton Rouge, La. Glacial outbursts, such as the Aug. 14 one at Hubbard, are a unique natural phenomenon, with some potentially serious effects on local communities, public lands and shipping channels. USGS scientists monitor the glacier's patterns of advance and retreat to be able to predict these effects as far in advance as possible. Hubbard Glacier will continue the advance it began more tha
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Contact: Office of Communications
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United States Geological Survey
10-Sep-2002


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