ࡱ> WYV bjbj ->jjElVVVVrrr8,LmFDD(lll<<<EEEEEEE$G JFr<9><<<F<VVllk'F<<<<(VlrlE<<E<<B:EL&rEl8 `op=<dE E=F0mFE.J<JE<VVVV1.4.9 Human Impact on an Ecosystem 1 Pollution Worksheet  Human Impact on Ecosystems We are going to look at 3 ways that humans affect ecosystems: _______________________ _______________________ _______________________ Pollution must be related to habitat studied. Pollution Pollution is ______________________________________________________________________ ________________________________________________________________________________ It is the ____________________________________________ and affects _________, ____________ _____________, __________, ____________ and ____________. Chemicals of human origin that harm the environment are called _______________________.  Some types of Pollution _________________________________ ______________________________________ ______________________________________ ______________________________________  Pollutants are produced by ________________________________________ CO2 from respiration is _________________________________ why? ______________________________________________________________________________ excess CO2 from burning fossil fuels is SO2 from marshes & volcanoes is _______________________________________ why? ______________________________________________________________________________ SO2 from factory chimney is  Pollutants Some pollutants are __________________________________________ in an environment, e.g. ________________, but levels are _________________________ by human activity. Other pollutants never exist in an environment e.g. ________________________________  From the Syllabus & Guidelines The Syllabus states: Study the effects of any one pollutant. The Guidelines for Teachers states: Give the effects of one pollutant from any of the following areas: domestic, agricultural, industrial. and Give an example of one way in which pollution may be controlled in the selected area. What follows is only a sample of the pollutants available.  Effect of one pollutant from one area - Agricultural, Industrial or Domestic   Eutrophication & Algal bloom eutrophication: a condition where lakes become ______________________________, resulting from excess artificial fertilisers washed into rivers and lakes. There is a _____________________________________ (algal bloom) as they use up the nutrients. When __________________________________ the ___________________ and are _____________________________________, which _____________________ in the water resulting in the ______________________________________ such as fish. Control of Pollutants in the selected area - Agricultural, Industrial or Domestic   Ecological impact of one human activity Burning Fossil Fuels  Acidic oxides and acid rain All rain is acidic __________________________________ CO2 in the air dissolves in rainwater to form _______________________________ pH = 5.5 in unpolluted air Acid rain refers to __________________________ with a pH of _________________ (Note: pH 4.5 is 10 times more acidic than pH 5.5) Acid rain Burning of fossil fuels (e.g. ______________________________________________) releases ___________________ into the air, especially __________________ and nitrogen oxides (NOx) SO2 dissolves in rainwater to form __________________________ (H2SO3) or reacts with particles in the air to form ________________________ (H2SO4) The resulting rain is _________________ and can be __________________________  Effects of acid rain Reduces ___________________ Phosphorus (P) ___________________________ and is ________________ to plant roots __________________ becomes soluble and poisonous and with ______________, ___________and _____________ is washed (leached) from the soil into lakes and water supplies Soil is ___________________ and ____________ in highly mineralised water. Why? ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________  Effects of acid rain Erodes _________________________________ buildings Causes _______________________________________ irritates the delicate lining of the lungs Inhibits ________________________ formation and ___________________________ of plants  Effects of acid rain Acid rain is a ______________________________ i.e. it is formed in one country but transported or blown huge distances to another. Norway imported its acid pollutions from the __________________________________ and the ______________________ in Germany. Ireland is lucky that the prevailing winds are from the Atlantic and not from Europe.  Dealing with acid rain Reducing the __________________________________________________________ Using __________________________________________________________________ (scrubbers are fitted to the insides of chimneys) ______________________________________ fitted to modern cars Developing ___________________________________________ sources  Need to know Define the term: Pollution. State areas affected by pollution. State mechanisms to control pollution. Explain the difference between the terms pollutant and pollution. Discuss the ecological impact of one human activity. 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