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When I was discovering the "Earth from Above" pictures, I was bedeviled by the image below. I thought it was Mammoth Hot Springs in Yellowstone NP, and it wasn't labeled. It took a bit of searching to find out where it was -- and I was surprised to also find out I'd never heard of it before. The image is of Pamukkale, a famous site in Turkey that features active, large travertine terraces. Apparently they aren't as hot as Mammoth, because people can clearly wade and immerse in them. Below are some additional images and links about Pamukkale. Pamukkale, a...

Marine Organisms Threatened By Increasingly Acidic Ocean Corals and Plankton May Have Difficulty Making Shells Every day, the average person on the planet burns enough fossil fuel to emit 24 pounds of carbon dioxide to the atmosphere, out of which about nine pounds is then taken up by the ocean. As this CO2 combines with seawater, it forms an acid in a process known as ocean acidification. A new study by an international team of oceanographers published in the September 29, 2005 issue of Nature reports that ocean acidification could result in corrosive chemical conditions much sooner than previously thought....