What is covered - chapter 4, 4a (the two cycles are linked and interdependent )
September 13, 2022
1
2021/2022
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geography
a level
a level geography
ocr
ocr geography
human activity
water
carbon
irrigation
year 12
year 13
sixth form
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1.2. To what extent are the water and carbon cycles linked?
4a. The two cycles are linked and interdependent
How human activities cause changes in water stores: How human activities cause changes in ca
Irrigation Deforestation
Rising demand for water for irrigation has created acute shortages More carbon in the atmosphere - les
Overpumping of aquifers in the coastal regions of Bangladesh has led to have a global impact e.g. global warmi
incursion of salt water, often making the water unfit for irrigation & = enhanced greenhouse effect
drinking Less leaf litter - less nutrients in soil, les
Urbanisation disrupting the cycle
When urbanisation occurs the ground surface becomes impermeable = Massive deforestation has reduced the
less groundwater storage, less water absorbed into soils nearly 50% - amount of carbon
More infrastructure taking place = deforestation photosynthesis has declined steeply
Can occur due to urbanisation – more
Deforestation use change transfers 1 billion tonnes o
Increased surface run-off since there are less tree roots to intercept =
potential flooding Releasing of carbon into the atmosphere
Trees & plants are responsible for extracting groundwater & releasing it Currently approx 8 bill tonnes of carbo
to the atmosphere by burning fossil fuels
Carbon extraction
Trans Alaska Pipeline: (oil transportation) The world relies on fossil fuels for 87
rapid industrialisation of Chinese & Ind
One of the largest pipelines in the world (800 miles long) & built from The exploitation of coal, oil & natural g
1974-77 from geological store
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