Drought
Overzicht
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.
Doelstellingen
- 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.
Lesnotitie
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Lesevaluatie
Gefeliciteerd met het voltooien van de les op Drought. Nu je de sleutelconcepten en ideeën, het is tijd om uw kennis op de proef te stellen. Deze sectie biedt een verscheidenheid aan oefeningen vragen die bedoeld zijn om uw begrip te vergroten en u te helpen uw begrip van de stof te peilen.
Je zult een mix van vraagtypen tegenkomen, waaronder meerkeuzevragen, korte antwoordvragen en essayvragen. Elke vraag is zorgvuldig samengesteld om verschillende aspecten van je kennis en kritisch denkvermogen te beoordelen.
Gebruik dit evaluatiegedeelte als een kans om je begrip van het onderwerp te versterken en om gebieden te identificeren waar je mogelijk extra studie nodig hebt. Laat je niet ontmoedigen door eventuele uitdagingen die je tegenkomt; beschouw ze in plaats daarvan als kansen voor groei en verbetering.
- 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
Beschikbaar in de Green Bridge-app
Download de Green Bridge CBT-app op je telefoon of computer voor toegang tot volledige lesnotities, oefenvragen en meer.
Beschikbaar in de Green Bridge-app
Download de Green Bridge CBT-app op je telefoon of computer voor toegang tot volledige lesnotities, oefenvragen en meer.
Aanbevolen Boeken
Oefen Proefexamenvragen
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