際際滷

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Drought and
Desertification
Grade 11
OUGHDRT NEFIDACOITIRSET
REVORAGZING RATSATIVON
UNSCRAMBLETHE FF.WORDS!
LESSON OUTCOMES
BYTHE END OFTHE LESSON,YOU MUST:
 DEFINETHETERMS DROUGHT & DESERTIFICATION.
 EXAMINETHE CAUSES OF DROUGHTS & DESERTIFICATION ON
CLIMATE CHANGE & HUMAN LEVEL.
 DISCUSSTHE EFFECTS OF DROUGHT & DESERTIFICATION ON
PEOPLE &THE ENVIRONMENT.
 DESIGN A MANAGEMENT PLAN FOR DROUGHT &
DESERTIFICATION.
DROUGHT ^0 DESERTIFICATION.COMPLETE [Autosaved].pptx
INTRODUCTION
QUESTIONSTO GIVEYOU
SOME FOOD FOR
THOUGHT
WHAT IS DROUGHT?
WHAT IS DESERTIFICATION?
DEFINITIONS
DROUGHT
 A LONG PERIODOF BELOW
AVERAGE RAINFALL.
CLICK HERETOWATCH AVIDEO
ON DROUGHT & DESERTIFICATION!
DESERTIFICATION
 THE PROCESS BYWHICH AN AREA
THAT WAS ONCE FERTILE BECOMES
A DESERT.
Causes of Drought
 Changing patterns of rainfall
 Hight temperatures
 Low relative humidity
 Greater amounts of sunshine
 Less cloud cover
Causes of Desertification
 Poverty?? But how?
 Human activities
 Climate change
Causes of Desertification
 Overgrazing
 Overcultivation
 Deforestation
 Population growth- overuse of natural resources.
 Poverty- increased pressure on the land- soil fertility lost
 Increased evaporation of the soil moisture
The Effects of Drought and
Desertification on People
 Food shortages
 Starvation and malnutrition
 Increase in food prices
 Job losses
 Urbanization
 Less workers in the primary sector
The Effect of Drought and
Desertification on the environment
Water supply in rivers and lakes as well as underground lessens
 Water-more polluted-less fresh water reaches rivers & lakes
Reduced groundwater levels- reduce evapo-transpiration and
increased temps- fewer plants
Damage to natural habitats  reduce variety of plants and animals
in an area.
Dry vegetation, high temps & low humility increases frequency
and intensity of veld fires.
Management of the effect of droughts
 Satellite images
 Monitoring weather conditions and alerting people
 Construction of water storage facilities
 Water restrictions
Management of desertification
 Afforestation programmes
 Proper soil management
 Enlisting the support of local farmers
DROUGHT ^0 DESERTIFICATION.COMPLETE [Autosaved].pptx
DROUGHT ^0 DESERTIFICATION.COMPLETE [Autosaved].pptx

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DROUGHT ^0 DESERTIFICATION.COMPLETE [Autosaved].pptx

  • 3. LESSON OUTCOMES BYTHE END OFTHE LESSON,YOU MUST: DEFINETHETERMS DROUGHT & DESERTIFICATION. EXAMINETHE CAUSES OF DROUGHTS & DESERTIFICATION ON CLIMATE CHANGE & HUMAN LEVEL. DISCUSSTHE EFFECTS OF DROUGHT & DESERTIFICATION ON PEOPLE &THE ENVIRONMENT. DESIGN A MANAGEMENT PLAN FOR DROUGHT & DESERTIFICATION.
  • 5. INTRODUCTION QUESTIONSTO GIVEYOU SOME FOOD FOR THOUGHT WHAT IS DROUGHT? WHAT IS DESERTIFICATION?
  • 6. DEFINITIONS DROUGHT A LONG PERIODOF BELOW AVERAGE RAINFALL. CLICK HERETOWATCH AVIDEO ON DROUGHT & DESERTIFICATION! DESERTIFICATION THE PROCESS BYWHICH AN AREA THAT WAS ONCE FERTILE BECOMES A DESERT.
  • 7. Causes of Drought Changing patterns of rainfall Hight temperatures Low relative humidity Greater amounts of sunshine Less cloud cover
  • 8. Causes of Desertification Poverty?? But how? Human activities Climate change
  • 9. Causes of Desertification Overgrazing Overcultivation Deforestation Population growth- overuse of natural resources. Poverty- increased pressure on the land- soil fertility lost Increased evaporation of the soil moisture
  • 10. The Effects of Drought and Desertification on People Food shortages Starvation and malnutrition Increase in food prices Job losses Urbanization Less workers in the primary sector
  • 11. The Effect of Drought and Desertification on the environment Water supply in rivers and lakes as well as underground lessens Water-more polluted-less fresh water reaches rivers & lakes Reduced groundwater levels- reduce evapo-transpiration and increased temps- fewer plants Damage to natural habitats reduce variety of plants and animals in an area. Dry vegetation, high temps & low humility increases frequency and intensity of veld fires.
  • 12. Management of the effect of droughts Satellite images Monitoring weather conditions and alerting people Construction of water storage facilities Water restrictions
  • 13. Management of desertification Afforestation programmes Proper soil management Enlisting the support of local farmers