Dust Devils Stirring It Up
This set of images from NASA's Mars Exploration Rover Spirit shows dust devils tearing across the Martian landscape inside Gusev Crater. These wind-driven events stir up the soil and can be part of globe-encircling storms that transport dust and soil.
Full image and caption: http://photojournal.jpl.nasa.gov/catalog/PIA07139.
Image credit: NASA/JPL-Caltech/Texas A&M