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Three Gorges Dam, China
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Published June 13, 2007
The longest river in Asia, the Yangtze River brings mixed blessings to China. Although it meets the water needs of millions of people, the river regularly overflows its banks. To protect residents and land in the lower Yangtze floodplains, China began construction on the Three Gorges Dam in 1994.
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Mudtrails from Fishing Trawlers in Gulf of Mexico
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Published June 7, 2007
The pervasiveness of the influence of bottom trawlers on the Gulf of Mexico is evident in these images from NASA’s Landsat satellite. Showing two different areas of a single scene captured on October 24, 1999, the images reveal dozens of mudtrails streaking the Gulf in the wake of numerous trawlers, which appear as white dots. The amount of re-suspended sediment dredged up by the trawlers gives the water a cloudy appearance.
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Melting Ice Reveals New Island off Greenland
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Published June 3, 2007
Off the coast of Greenland lies an island resembling a bony claw. Long connected to Greenland’s coast by ice, the island escaped recognition for what it was for nearly a century.
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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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