CHAPTER 20 REVIEW: LIFE IN
THE SAHARA AND THE SAHEL:
ADAPTING TO A DESERT REGION
Introduction
 Oasis: An isolated spot where water is found
in the desert.
 Drought: Long periods with very little or no
...
The Geographic Setting
 Sahara covers about 3.5 million square miles
 Bordered by the Red Sea on the east and the
Atlant...
The World’s Largest Desert
 Used to have a wetter
climate, but 6,000 years
ago the climate changed.
 Trade winds:Winds t...
The Sahel: On the Sahara’s
Edge
 Marginal land: Land that is not well suited for
farming.
 Pastoral nomads: Groups of he...
The Desert Environment
 Ergs: Great seas of sand with tall sand dunes.
 Regs: Gravel-covered plains.
 Hammadas: High, r...
The Harsh Desert Climate
 Temperatures can vary greatly: Night time
below freezing and daytime over 100⁰F.
 Sandstorms
...
Adaptations to Desert Life
 TheWanderingTuareg
 “Blue Men of the
Desert”
 Nomads
 Trade for food
 Camel Caravans
Technology Makes Life Easier
 Satellite phones
 Creation of oases
 Better transportation
 Trucks vs. camels
 Planes b...
The Oasis Environment
 Islands of Water
Surrounded by Desert
 Natural creations
 Some man-made
 Large and Small
Center...
Adaptations to Life in the
Oases
 TheTraditional Ways of Oasis Settlers
 Cash crops: Dates, wheat, barley, vegetables.
...
Water Problems Limit the
Growth of Oasis Towns
 Mostly small villages
 Why people move here
 Jobs at factories
 Pastur...
The Sahel Environment
 Includes portions of:
 Niger
 Gambia
 Senegal
 Mauritania
 Mali
 Burkina Faso
 Nigeria
 Ch...
A Landscape Threatened by
Drought and Desertification
 Natural vegetation: grasslands, acacia trees,
baobab trees, small ...
Adaptation to Life in the
Sahel
 Most people are farmers or herders
 Plant crops : grains like millet and sorghum
 Shif...
Human Causes of
Desertification
 Cash crops
 Overgrazing of cattle
 Deforestation: Cutting
down trees for various
uses....
Beginning to Think Globally
 1/3 of Earth’s land is
arid or semiarid
 Some desert regions
expanding
 China
 Sandstorms...
Global Connections
 Are the world’s deserts
growing or shrinking?
 What human activities
contribute to
desertification?
...
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Chapter 20 review

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A recap of the material covered in Chapter 20 of Geography Alive textbook.

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Chapter 20 review

  1. 1. CHAPTER 20 REVIEW: LIFE IN THE SAHARA AND THE SAHEL: ADAPTING TO A DESERT REGION
  2. 2. Introduction  Oasis: An isolated spot where water is found in the desert.  Drought: Long periods with very little or no rain.  Physical Features: Mountains, lakes, rivers, etc.  Climate:The average temperature of a given place.
  3. 3. The Geographic Setting  Sahara covers about 3.5 million square miles  Bordered by the Red Sea on the east and the Atlantic Ocean on the west  Atlas Mountains in the north  Merges with the semiarid Sahel  Sahara and Sahel cover all or parts of 15 countries
  4. 4. The World’s Largest Desert  Used to have a wetter climate, but 6,000 years ago the climate changed.  Trade winds:Winds that begin in the northern latitudes and blow south towards the Equator.
  5. 5. The Sahel: On the Sahara’s Edge  Marginal land: Land that is not well suited for farming.  Pastoral nomads: Groups of herders who move with their animals from place to place in search of pasture and water.  Desertification:The process during which an area of land becomes increasingly dry.
  6. 6. The Desert Environment  Ergs: Great seas of sand with tall sand dunes.  Regs: Gravel-covered plains.  Hammadas: High, rock-covered flatlands.  Wadis: Dry riverbeds that can turn into raging rivers after a rain.
  7. 7. The Harsh Desert Climate  Temperatures can vary greatly: Night time below freezing and daytime over 100⁰F.  Sandstorms  Unpredictable rain  flash floods  Plant adaptations
  8. 8. Adaptations to Desert Life  TheWanderingTuareg  “Blue Men of the Desert”  Nomads  Trade for food  Camel Caravans
  9. 9. Technology Makes Life Easier  Satellite phones  Creation of oases  Better transportation  Trucks vs. camels  Planes between oases
  10. 10. The Oasis Environment  Islands of Water Surrounded by Desert  Natural creations  Some man-made  Large and Small Centers of Life  Various plants and animals
  11. 11. Adaptations to Life in the Oases  TheTraditional Ways of Oasis Settlers  Cash crops: Dates, wheat, barley, vegetables.  Trade for goods  Homes made of mud bricks  Work done in the evening  Windbreaks:A wall or hedge that breaks the force of the wind.
  12. 12. Water Problems Limit the Growth of Oasis Towns  Mostly small villages  Why people move here  Jobs at factories  Pasture for animals  Refuge from drought or wars  Kinds of water problems  How to get water during expansion  Water shortages
  13. 13. The Sahel Environment  Includes portions of:  Niger  Gambia  Senegal  Mauritania  Mali  Burkina Faso  Nigeria  Chad  Sudan
  14. 14. A Landscape Threatened by Drought and Desertification  Natural vegetation: grasslands, acacia trees, baobab trees, small bushes.  Not fertile soil  Water is scarce most of the year  Farther south=rain more plentiful  Varied vegetation
  15. 15. Adaptation to Life in the Sahel  Most people are farmers or herders  Plant crops : grains like millet and sorghum  Shifting agriculture: Plant some crops on a plot of land for a year or two, then planted a different field.  Herders use a similar system to feed the animals
  16. 16. Human Causes of Desertification  Cash crops  Overgrazing of cattle  Deforestation: Cutting down trees for various uses.  Erosion:The process of wearing down a piece of land.
  17. 17. Beginning to Think Globally  1/3 of Earth’s land is arid or semiarid  Some desert regions expanding  China  Sandstorms  Desertification A sandstorm in China.
  18. 18. Global Connections  Are the world’s deserts growing or shrinking?  What human activities contribute to desertification?  How might people adapt to living in areas threatened by desertification?
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