Soil Erosion
Akopọ
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.
Awọn Afojusun
- 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.
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Soil Erosion. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Soil Erosion? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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