Answer» Correct Answer - Option 3 : Transverse dunes
Sand dunes formed as long elongated ridges oriented at right angles to the wind directions known as Transverse dunes. | Landform | Characteristics | | Star dunes | - Irregular shaped, have three or more arms
- Form when the wind changes direction a lot of time
- They tend to accumulate in areas with multidirectional wind regimes.
- They dominate the Grand Erg Oriental of the Sahara
- The Star dune of Badain Jaran Desert of China is the tallest dunes on Earth.
| | Barchans | - The barchan dune is a horseshoe-shaped dune with the front curve facing into the wind.
- Barchan dunes are often found in groups, but occasionally alone.
- They often move over a flat surface of pebbles or bedrock.
- The slip face of a barchan is away from the wind.
| | Transverse dunes | - It forms long lines of ridged dunes that are perpendicular to the wind direction.
- They have steep slip faces at the back sides of the ridges.
- These wavy dunes form in areas with plenty of sand and not much plant life.
- The sand dunes found behind beaches are often transverse dunes formed by strong ocean winds.
| | Seifs | - Seif dunes are linear (or slightly sinuous) dunes with two slip faces which make them sharp-crested
- Seif dunes are associated with bidirectional winds
- The long axes and ridges of these dunes extend along the resultant direction of sand movement
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