Yardangs are composed of sand grains that have clumped together and have become more resistant to erosion than their surrounding materials. They also serve as a useful indicator of the prevailing wind direction.

ID: ESP_055628_1895
date: 9 June 2018
altitude: 276 km

https://uahirise.org/hipod/ESP_055628_1895
NASA/JPL-Caltech/UArizona
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