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Wind Carved Rock on Mars

The distinctively fluted surface and elongated hills in this image in Medusae Fossae are caused by wind erosion of a soft fine-grained rock. Called yardangs, these features are aligned with the prevailing wind direction. This wind direction would have dominated for a very long time to carve these large-scale features into the exposed rock. via NASA http://www.nasa.gov/image-feature/wind-carved-rock-on-mars Amazing.

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