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Intersecting swirling trails left by the earlier passage of dust...

Intersecting swirling trails left by the earlier passage of dust devils across sand dunes, as they lifted lighter reddish-pink dust and exposed the darker material below. Also visible are darker slope streaks along dune edges, formed by a process which is still under investigation. More, or see location on Google Mars. (via Martian landscapes - The Big Picture - Boston.com)
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