'They are crescentic or moon-shaped and occur individually or in groups'. The above description refers to

Assessment: WAEC SSCE - Geography - 2004 (Objective) Subject: Geography

Question 1 Report

'They are crescentic or moon-shaped and occur individually or in groups'. The above description refers to
Answer Details
The description "They are crescentic or moon-shaped and occur individually or in groups" refers to a type of sand dune known as "barchans". Barchans are crescent-shaped dunes formed by the action of wind, which blows sand grains up the gently-sloping windward side and deposits them on the steeply-sloping lee side. They are commonly found in arid regions and can occur singly or in groups.
Read lesson note on Physical Geography (JAMB)
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