Question

Give 2 differences between longitudinal and parabolic sand dunes​

Answer 1

Answer:

U-shaped mounds of sand with convex noses trailed by elongated arms are parabolic dunes. These dunes are formed from blowout dunes where the erosion of vegetated sand leads to a U-shaped depression.

A large, elongated dune lying parallel to the prevailing wind direction. Longitudinal dunes usually have symmetrical cross sections. They generally form in areas that are located behind an obstacle where sand is abundant and the wind is constant and strong.

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Answer 2

The parabolic dune is crescent-shaped, with vegetation-anchored tips that point in the upwind direction, and has a steep downwind slip face. The largest, and somewhat mysterious dunes, are longitudinal dunes, which are large symmetrical ridges of sand that form parallel to the primary wind direction.

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