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 a writer and musician based near Chicago and a regular contributor to TheAtlantic.com.
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