extreme environments -deserts
- Created by: 12cpar01
- Created on: 12-11-16 21:22
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- extreme environments DESERTS
- threats
- desertification
- "spread of the desert - the process in which the land dries out until little or no vegetation can survive
- human
- over cultivation
- continual growth of crops
- over grazing
- overuse of fulewood
- overuse of available water
- over-population
- over cultivation
- physical
- climate change
- soil errosion
- vegetation cover washed or blown away
- people
- most damaging
- hotel owner
- UK population
- crop farmers
- hydro electric dam
- Tribal village
- least damaging
- Tribal village
- hydro electric dam
- crop farmers
- UK population
- hotel owner
- most damaging
- desertification
- location
- found round tropics
- 15 to 30 degrees north and south of equator
- western fringes of continents
- found round tropics
- why are they hot and dry
- small surface area and thin atmosphere=heat up quickly
- cold ocean currents
- warm moist wind--}sea fog(cold ocean current)--}cold dry wind hits desert fringe
- Hadley cell = warm air rises and cool air falls (clouds round equator)
- mountain barriers
- warm moist air from pacific hits mountain range=rain shadow= cold dry wind on desert
- prevailing winds
- wind across desert has little moisture=no rainfall
- how they are formed
- close to tropics
- warm air rises = Hadley cell
- prevailing winds
- pick up little moisture=little rainfall
- mountain ranges
- rain shadow=dry air
- thin atmosphere
- more concentrated solar rays
- cold ocean currents
- sea fog= cold dry air towards fringes
- close to tropics
- management
- PROBLEM WATER EROSION FROM SOIL
- Replanting trees
- earth bunds
- collects water
- gully plugs
- slow down water flow
- terracing
- steps cut into hillls
- PROBLEM WIND EROSION FROM SOIL
- Reafforestation
- coppicing
- animal husbandry
- only keeping the fittest animals
- grassland development
- conserves water and soil
- wind breaks
- stop wind blowing
- crop rotation
- allow minerals to return to soil
- Reafforestation
- PROBLEM LACK OF CROPS FOR FARMERS
- desalinisation
- crops grown deep in ground=expensive for farmers
- GM crops
- expensive and not liked by many people
- desalinisation
- PROBLEM WATER EROSION FROM SOIL
- case study
- named examples
- great sandy desert - Oceania
- Sahara desert - Africa
- named examples
- threats
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