2nd Place: Biology or Geology?

NASA's Goddard Space Flight Center/USGS

In 2nd Place: Biology or Geology?

The top photo above shows the Yukon Delta acquired by Landsat 7 on Sept. 22, 2002.

"Countless lakes, sloughs, and ponds are scattered throughout this scene of the Yukon Delta in southwest Alaska. One of the largest river deltas in the world, and protected as part of the Yukon Delta National Wildlife Refuge, the river's sinuous waterways seem like blood vessels branching out to enclose an organ," reported NASA.

PHOTOS: Earth's Blue Marble Beauty

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