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Deserts Revision (Definition (Day time temperatures (50 Degrees Celcius),…

- - - - Over population
        
        People farm too much on the land and far more intensively therefore land quality decreases
      - Overgrazing
        
        Too many cattle eat the plants faster than they can grow.
        
        Soil exposed and eroded
        
        Animals trample on the soil leading to further erosion.
      - Over Cultivation and soil erosion
        
        Too many crops planting in one area
        
        Use all up the nutrients
        
        Increase soil erosion
      - Removal of firewood
        
        No rooths to keep soil in place
        
        Breaks down the nutrient cycle
        
        Causes soil erosion
    - - Drought
        
        Less than average rainfall on a specific place
      - Soil Erosion
        
        Vegetation has been destroyed the soil is exposed
        
        Half of the topsoil of the earth has been lost in the past 150 years
      - Climate change
        
        Increasing global temperatures
        
        Less reliable rainfall
        
        Reduced amount of natural vegetation
        
        Plant roots die and erode quickly
  - - - Planting acacia trees after desertification
      - Started in 2004 from UN and FAO
      - Provided seeds and taught them how to grow them
      - Tractor with half moon shape digger tools which are adapted to the dry conditions
        
        Collect rainwater
      - Prevent soil erosion and provides nutrients for the soil and lets other plants grow
        
        Removes carbon from the atmosphere
      - Fodder for livestock
      - Sell gum to manufacturing companies
        
        Economical factor
- - - - Keeps sand out from sandstorms
    - - Keeps sand out
      - Able to close their nostrils
    - - Eats prickly desert plant without feeling pain
      - Allow a range of food to be able to eat
    - - Spread the weight across the sand
      - Don't sink
      - Don't get too hot
    - - Heat loss easy
      - Keeps a core body temperature at 42 degrees celcius
    - - Stores fat
      - Can be turned into water for use
    - - Top of body can shade the lower areas
    - - Camouflage
      - Can become a predator
    - - for burning fuel and heating
      - Low water loss
    - - Keep core body temperature
      - Don't have to take in heat
- - - - 1990 - All desert
        
        2008 - Urbanised
    - - Lots of solar energy
      - Google invest $185 million
      - Less sand storms
      - Various parts ideal for solar panels as there is less dust and clear skies all year
      - 10% renewable energy by 2023
    - - Hidden water reserves in the deserts
      - Able to grow own crops
      - Less exported food
    - - Larges natural resource deposit
      - 1/5 of world's oil reserves under Arabian Desert
      - 9-10 Million barrels a day
      - Largest oil exporter
      - Gold found in 600 sites in Saudi Arabia
      - 400 tonnes of ore per day