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Action of Wind and Water on Arid Areas Topical Questions and Answers: Form 3 Geography

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Summary

Explore how wind and water impact arid areas with these comprehensive Form 3 Geography topical questions and answers.

2. a) (i) Two process through which wind erodes the surface
-Deflation
-Abrasion
-Attrition
(ii) Three ways through which wind transports its load
Suspension
- The fine dust particles are lifted and suspended in the air
- Eventually they are blown away by wind currents
Saltation
- Larger fragments/sand particles are lifted from the ground by eddy
actions
- They are moved in a series of hops/jumps by wind currents
Surface creep/attraction
- The heavy materials /small stones/pebbles are dragged along the
ground by wind currents
b) (i) How an oasis is forced
- A pre-existing depression formed through faulting or otherwise is
exposed to wind erosion
- Wind eddies remove unconsolidated materials through deflation
- As deflation continues, the depression is deepened and enlarged.
- The process of deflation is aided by weathering
- With continued deflation, the level of the water table is reached.
- Water oozes out of the ground collects into the depression to form
a lake known as oasis.
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