Multiple choice

Which of the following are formed when the sand surface is partially covered with vegetation?

  1. Parabolic dunes

  2. Barchans

  3. Seifs

  4. Levees
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A Correct answer
Explanation

Parabolic dunes are formed when vegetation partially covers the sand surface, anchoring the dune arms while the center remains mobile. This creates a U-shaped dune with the horns pointing upwind (opposite to barchans). Barchans are crescent-shaped dunes without vegetation, seifs are longitudinal dunes, and levees are river deposits, not dune types.

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