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This astronaut photograph taken on Nov. 27, 2010, provides a view of tidal flats and channels near Sandy Cay, on the western side of Long Island, and along the eastern margin of the Great Bahama Bank, on the islands of Bahamas. The continuously exposed parts of the island are brown, a result of soil formation and vegetation growth. To the north of Sandy Cay, an off-white tidal flat composed of carbonate sediments is visible; light blue-green regions indicate shallow water on the tidal flat.

NASA / AFP / Getty Images