Which mechanism causes the alignment of barchan dune horns perpendicular to wind?

💡 Explanation

Dune horn alignment results from differential sediment transport rates, because the thinner, less obstructed horn tips move faster than the dune body as wind speed is relatively consistent, therefore horns extend downwind rather than eroding due to frost or uplift.

• Which consequence follows from intensified Icelandic Low pressure?
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• Which outcome typically occurs when intense mechanical weathering reduces mountain slopes adjacent to loess plains?