1. Higher Hydrosphere Hydrological Cycle: Human[Date] Today I will: - Know how humans have an impact on the hydrological cycle The Hydrological Cycle is a natural process; however, humans can have an impact on the system in various ways

2. Higher Hydrosphere As I go through the PowerPoint add in the relevant information to your mind map. Feel free to add additional information from your summary notes or textbook when you are finished.

3. Higher Hydrosphere Mining - Lakes, rivers and reservoirs ‘silt up’ leading to reduced storage capacity in these areas. There is reduced vegetation cover which leads to: -increased run-off -lower evapo -transpiration and cloud formation altering the rainfall pattern. Mining for gold in the Amazon

4. Higher Hydrosphere Irrigation - It involves taking water from a river or underground store which can: - reduce river flow -lower water tables -It can increase evaporation/evapo-transpiration by placing water in surface stores (ditches/canals) -Crops remove water from the cycle as they grow

5. Higher Hydrosphere Deforestation -Cutting down trees increases run-off - It decreases evapo-transpiration (and therefore cloud formation) -more extreme river flows as water is not intercepted

6. Higher Hydrosphere Urbanisation - The removal of natural vegetation and replacement with impermeable surfaces and drains can speed up overland flow and evaporation and can lead to higher river levels. - It also decreases the amount of water which returns to groundwater storage, possibly reducing the water table. - It requires taking water for use in the cities which reduces water in rivers (due to reservoirs) or groundwater (due to wells)

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