Theory question 207
Environmental Hazards and Conservation(a)(i) Name two distinct types of soil erosion (ii) Locate an area where each type is most common
(b) Outline any three factors that have been responsible for any one of the types of soil erosion named above
(c) Describe any three measures being taken to solve the problem of soil erosion in any one of the areas.
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(a)(i) Water erosion (sheet, rill, gully) and wind erosion (ii) Gully erosion – south-eastern Nigeria (Agulu-Nanka, Anambra/Imo); wind erosion – the far north (Sokoto, Borno), Sahel
(b) Gully (water) erosion: heavy, intense rainfall; steep slopes; loose sandy soils (e.g. on the Nanka sands); deforestation and farming on slopes; overpopulation and road building
(c) Afforestation and planting of grass/cover crops; contour ploughing and ridging; terracing; building drainage channels and check dams; strip cropping; government erosion-control projects
Keep (b) and (c) to the same type of erosion.