Drought
Akopọ
Drought is the slow hazard. There is no sudden shock as with an earthquake or a storm; instead the rains simply fail, week after week, until the rivers shrink, the soil cracks and the crops wither. A drought is a period of dry weather longer or more severe than normal, and because it builds so quietly it is easy to underestimate until a region tips into water shortage, crop failure and even famine.
In this lesson you will learn what causes droughts, from natural shifts in rainfall and pressure to the human pressures of farming and climate change, and why a drought can feed on itself in a vicious circle. You will then follow the Environmental Management chain of cause, impact and management, using the devastating 2011 East Africa drought as a named example, and weigh up the strategies, from emergency water supplies to desalination, that communities use to survive when the rains do not come.
Awọn Afojusun
- 6.4.1 Define a drought as a period of dry weather that is longer or more severe than normal.
- 6.4.2 Describe and explain the causes of drought, limited to: (a) lack of rain (b) climate change: increase in global temperatures and increase in extreme weather events.
- 6.4.3 Describe and explain the impacts of drought on people and the environment, limited to: (a) water sources dry up (b) loss of crops, livestock and habitats (c) soil erosion (d) desertification (e) death of organisms (f) famine (g) increased risk of wildfires (h) decrease in air quality (i) financial losses (j) human health.
- 6.4.4 Describe strategies for managing the impacts before, during and after a drought, limited to: (a) monitoring and warning (b) emergency water supplies (c) water conservation (d) increasing water supply (dams and reservoirs, use of aquifers and wells, desalination and rainwater harvesting) (e) international aid.
- 6.4.5 Discuss the benefits and limitations of strategies for managing the impacts before, during and after a drought.
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 Drought. 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.
- A drought is best defined as: A. Any month with no rainfall B. A period of dry weather longer or more severe than normal for a region C. A permanent desert climate D. A single failed harvest Answer: B
- Which weather feature is most likely to bring a drought? A. A deep low-pressure system B. A persistent high-pressure system C. A warm front D. A tropical cyclone Answer: B
- The process by which once-fertile land turns into desert is called: A. Desalination B. Infiltration C. Desertification D. Transpiration Answer: C
- Which strategy increases the water supply during a drought? A. Drought-tolerant crops B. Reducing water waste C. Desalination of sea water D. Recycling water Answer: C
- Why can the loss of vegetation make a drought worse? A. It increases transpiration and rainfall B. It reduces transpiration, so less rain forms C. It raises the water table D. It cools the soil Answer: B
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 Drought? 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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