(a) Outline three differences between deflation and abrasion
(b) Using specific examples, describe the mode of formation of a deflation hollow
(a) *deflation involves blowing away of loose rock wastes while abrasion involves hauling rocks against rock surfaces
*deflation involves rolling loose rock materials along the ground where as abrasion involves polishing, scratching and wearing away of rock surfaces
*delation usually results in lowering of land surfaces while abrasion is most effective at the base of rock
(b) *a feature of arid region
*a product of wind deflation
*a basin or sauceer-shaped desert landform
*wind exerts frictional force on loose rocks particles on the surface
*involves the lifting of loose materials from the ground
*it also involves scooping away of loose sandy materials
*the loose materials lifted are blown away
*this action consequently lowers the land surface
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