Matching Dune Shapes and Alignments with Specific Names

This question requires matching different types of sand dunes based on their shape and alignment with specific names. Understanding these classifications is key in geomorphology.

Key Dune Classifications and Matches

• Longitudinal Dunes: These dunes are elongated and aligned parallel to the prevailing wind direction. Seif (C) dunes are a specific type characterized by this alignment. Therefore, I matches with C.
• Transverse Dunes: These dunes form perpendicular to the wind direction, typically in areas with ample sand supply and consistent winds. Barchan (D) dunes, known for their crescent shape with horns pointing downwind, are a common type of transverse dune. Therefore, II matches with D.
• Parabolic Dunes: These are U-shaped dunes whose open end faces the wind. They are often found in semi-arid regions or coastal areas where vegetation helps stabilize the trailing arms. The match with Coastal (B) reflects this common occurrence. Therefore, III matches with B.
• Complex Dunes: These dunes exhibit irregular shapes resulting from complex wind patterns or the merging of simpler dune types. Reversing (A) dunes, which can change shape or orientation due to shifts in wind direction, fall under this complex category. Therefore, IV matches with A.

Summary of Correct Matches

Based on the analysis, the correct matching is:

• I. Longitudinal - C. Seif
• II. Transverse - D. Barchan
• III. Parabolic - B. Coastal
• IV. Complex - A. Reversing

This corresponds to the arrangement I-C, II-D, III-B, IV-A.

The correct option reflecting these matches is Option 1.