NASA Sees Earth's Skies as a Motley Swirl: Today's Pic

NASA scientists produced this image to study the behavior of aerosols -- tiny airborne particles -- in the Earth's climate system. Dust, in red, is lifted from the surface. Sea salt, in blue, swirls inside cyclones. Smoke, in green, rises from fires. Sulfate particles, in white, stream from volcanoes and fossil fuel emissions, NASA writes.

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