📖 what
What is a barchan dune?
GeographyDeserts
Quick Answer
A barchan dune is a crescent-shaped sand dune formed by one main wind direction. Its horns point downwind.
The Full Story
Barchan dunes are common in sandy deserts where wind blows steadily from one direction and sand supply is limited. They form a curved crescent shape with the two tips, or horns, extending in the direction of the wind. These dunes migrate over time as wind pushes sand up the gentle windward side and it avalanches down the steeper slip face. Barchans are a classic example of how wind and sand interact to create moving landforms.
Key Facts
1.Barchan dunes have crescent shapes
2.Their horns point downwind
3.They form best under steady winds and limited sand supply
YouTube Angle
Suggested video title for this topic:
"Why some desert dunes look like giant crescents"