Earth From Space: The 'Black' Sea, Turned Blue

sea615.jpg

NASA

This is the Black Sea, indeed, but it's conspicuously bluer than the also-visible Mediterranean. Every summer, a form of phytoplankton shed calcite and turn the water cyan. This picture is from just a few days ago -- July 15, 2012 -- but the plankton have made their habitat in the sea for millennia.

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Robinson Meyer is an associate editor at The Atlantic, where he covers technology.

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