Soil Erosion
Bayani Gaba-gaba
Topsoil is the thin, dark, fertile skin of the land, and it takes nature hundreds of years to build a few centimetres of it. Yet a single storm on a bare hillside, or a season of drought on overworked ground, can strip it away in days. When the topsoil goes, so does the fertility, and once-productive farmland can turn to dust or desert.
In this lesson you will learn what causes soil erosion, the chain of damage it sets off from silted rivers to famine and the movement of whole communities, and the practical methods farmers use to hold soil in place. By the end you should be able to link a cause to its impact and recommend a suitable conservation method for a given piece of land, which is exactly what the exam asks.
Manufura
- 2.3.1 Describe the causes of soil erosion, limited to: (a) unsustainable agricultural practices (b) deforestation (c) farming on steep slopes (d) bare soil (e) wind and water erosion.
- 2.3.2 Describe the impacts of soil erosion, limited to: (a) silting of rivers (b) desertification (c) mass movement: landslides, rockslides and mudslides (d) loss of habitats and biodiversity (e) reduction in crop yield (f) malnutrition and famine (g) displacement of people.
- 2.3.3 Describe and explain strategies to reduce soil erosion, limited to: (a) terracing: reduces movement of soil and surface run-off (b) contour ploughing: reduces surface run-off (c) bunds: reduces surface run-off, reduces wind speed and wind erosion (d) wind breaks: protects crops, reduces wind speed and wind erosion (e) maintaining vegetation cover: roots bind the soil, vegetation reduces surface run-off and absorbs water (f) addition of organic matter: improves soil structure.
Takardar Darasi
Akwai a cikin manhajar Green Bridge
Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.
Nazarin Darasi
Barka da kammala darasi akan Soil Erosion. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.
- Which of these is a major cause of soil erosion? A. Planting windbreaks B. Adding organic matter C. Removing natural vegetation D. Contour ploughing Answer: C
- A deep channel cut into the soil by fast-flowing rainwater run-off is called a: A. Terrace B. Bund C. Gully D. Windbreak Answer: C
- Terracing reduces soil erosion mainly by: A. Increasing wind speed B. Reducing surface run-off on slopes C. Removing all vegetation D. Drying out the soil Answer: B
- The process by which fertile land turns into desert is called: A. Salinisation B. Eutrophication C. Desertification D. Silting Answer: C
- Which method is most suitable for reducing WIND erosion on a flat, dry field? A. Terracing B. Contour ploughing C. A windbreak D. Deeper ploughing Answer: C
Akwai a cikin manhajar Green Bridge
Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.
Akwai a cikin manhajar Green Bridge
Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.
Littattafan da ake ba da shawarar karantawa
Yi Aikin Tambayoyin Gwaji
Kana son yin aikin tambayoyin gwaji kan Soil Erosion? Sauke manhajar Green Bridge CBT don samun tambayoyin gwaji da cikakkun jarrabawa akan wannan batu.
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Duk abin da kake buƙata don yin fice a JAMB, WAEC & NECO.
