1. Which term does not belong with the others _ cirque, tarn, barchan ? 2. The orientation of the barchan dunes suggest that they were generated by northeasterly winds. 3. Liu Hsin Crater shows some barchan dunes. 4. I happened to be looking at this digital terrain model of a barchan on Mars today. 5. What type of dunes are they-Barchan , Transverse, Longitudinal, Concave, Parabolic or Star? 6. The team established that the region contributes substantially to global atmospheric dust due to its diatomite and mega-barchan dunes. 7. When there are perfect conditions for producing sand dunes, steady wind in one direction and just enough sand, a barchan sand dune forms. 8. If the prevailing wind then becomes dominant for a lengthy period of time the dune will revert to its barchan form, with one exaggerated wing. 9. Small simple barchan dunes and large mega-barchans are common at the margins of Olympia Undae and in areas where the sand cover is thin. 10. Barchan dunes are produced by strong winds blowing across a level surface, and are crescent-shaped with the concave side away from the wind.
