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Water Scarcity & Desertification - PowerPoint PPT Presentation
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Water Scarcity & Desertification. Photo credit: Natphotos/Getty Images, National Geographic. Africa’s Namib Desert. Essential Questions:. What is desertification? Is there a connection between the scarcity of water and desertification? Can we eliminate/reduce desertification?
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Water Scarcity & Desertification
Photo credit: Natphotos/Getty Images, National Geographic.
Africa’s Namib Desert
© The GlobalEd 2 Project
Essential Questions:
- What is desertification?
- Is there a connection between the scarcity of water and desertification?
- Can we eliminate/reduce desertification?
- Why should I care about desertification, anyway?
© The GlobalEd 2 Project
Enduring Understandings:
- Desertification occurs when the groundwater table decreases to such a level that it drains an arid or semiarid land of its life-supporting capabilities-
- Salt accumulation in the topsoil
- Decrease in surface water
- Increased erosion
- Disappearance of native vegetation
© The GlobalEd 2 Project
Enduring Understandings:(continued)
- Desertification leads to a decline in available ground water.
- Desertification can be reduced.
- As there is a finite amount of water on Earth, we must reduce/eliminate things that cause a reduction in available ground water.
© The GlobalEd 2 Project
Causes of Desertification
- Improper crop rotation
- Inadequate draining or poor irrigation practices
- Huge demands on ground water
- Deforestation
- Drastic decrease in soil nutrients, leading to loss of vegetation cover
© The GlobalEd 2 Project
Effects of Desertification
- Increased frequency of drought
- Increased frequency of sand/dust storms
- Greater occurrence of flooding
- Reduction in available ground water
© The GlobalEd 2 Project
Reducing Desertification
- Proper crop rotation
- Less water-demanding and drought-resistant crops
- Reduce soil erosion
- Reduce over-cultivation, over-grazing
- Improve land-management techniques
© The GlobalEd 2 Project
