water

• which area of the uk has the most rainfall

  north and west uk
• what does surplus mean 


  greater supply than demand
• what does deficit mean 


  greater demand than supply
• why do some places have a greater demand

  because of the population density
• what % of water used in uk household has risen since 1975


  70%
• how can water sources be polluted

  nitrates and phosphates from crop fertilisers washed into rivers and groundwater

  pollutants from vehicles and washed into water sources through runoff when it rains

  chemical and oil spills from factories can pollute local water sources and groundwater
• what is a disadvantage of dams

  expensive to build

  can affect wildlife e.g fish migration