Question

QUESTION 5 Match the statements describing a sand dune with the type of sand dunes on the right Long ridges of sand oriented parallel to the prevailing wind A. Barchanoid Solitary, crescent-shaped dunes oriented with their tips B. Transverse pointing downwind C. Star Ridges of sand oriented at right angles to the prevailing wind D Barchan E. Longitudinal Dunes whose tips point into the wind F. Parabolic Scalloped rows of sand oriented at right angles to the wind Isolated dunes consisting of three or four sharp-crested ridges diverging from a central high point

Answer 1

Note : arrows shown in figure denotes wind direction.

Long ridges of sand oriented parallel to the prevailing wind. Correct match option- E) Longitudinal Longitudnal Dune are formed with prevailing wind direction. These dunes are observed in deserts of Saudi Arabia and Nambia Solitary, crescent- shaped dunes oriented with their tips pointing downward Correct match option- D) Barchan CC Barchan dunes are formed such that their tips face the prevailing winds such that it make crescent like shape. These are observed in Sahara desert in Egypt and Gobi desert of Asia. Ridges of sand oriented at right angle to the prevailing winds Correct match option- B) Transverse Transverse dunes are formed when steady winds blow making a right angle. These are observed in Sahara desert Dunes whose tips points in to wind Correct match option- F) Parabolic Parabolic dune are formed when winds blow in such a way that that it forms pointed ends. They are observed in coastal areas or shores which are partly covered with vegetation Scalloped rows of sand oriented at right angles to the wind Correct match option- A) Barchanoid Barchanoid dunes are cause due to intermixing of Barchan dune and Transverse dune. These are observed in Sahara desert in Egypt and Gobi desert of Asia. Crescent shape Isolated dunes consisting of three or four sharp crested ridges diverging from central high point Correct match option- C) Star Star dunes are formed when winds blow from multiple directions such a way that it makes a star like shape. These are observed in Sahara desert in. Egypt and Gobi desert of Asia.