That they are not called the same.duhhh
A barchan dune has a crescent shape with horns pointing downwind and forms in areas with limited sand, while a parabolic dune has a U-shape with the horns pointing upwind and forms in areas with abundant sand. Additionally, barchan dunes are individual and migrate due to wind direction, while parabolic dunes are stationary and often found in coastal regions.
Barchan dunes are crescent-shaped with horns pointing downwind. Parabolic dunes have a U-shape with horns pointing upwind. Transverse dunes are long ridges perpendicular to the wind direction. Star dunes are complex, multi-crested dunes formed by variable wind directions.
barchan dunes
Parabolic dunes have trailing arms because the arms are usually 'held back' by surface vegetation. The vegetation acts to limit sediment transport by wind action and to consolidate the surface sands.
Barchan dunes are solitary crescent dunes formed on a flat, hard ground with limited supplies of sand and vegetation. Transverse dunes are a series of long ridges that are found in areas that have a lot of sand but sparse vegetation.
Barchan dunes are crescent-shaped dunes that are formed by winds blowing consistently in one direction. These winds are typically strong and blow a constant supply of sand, causing the dunes to migrate downwind.
Barchan dunes are curved dunes that have horns or points facing downwind due to a unidirectional wind flow. These types of dunes typically form in areas with consistent wind direction and limited sand supply.
parabolic dunes
parabolic dunes
A barchan is an arc-shaped sand ridge comprised of well-sorted sand.
barchan dunes
you need to sort out your grammer, because last time I checked it was "were".