1.4.9 Pollution Worksheet
1.4.9 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
_________________________________
1. ______________________________________
2. ______________________________________
3. ______________________________________
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.
END
-----------------------
Area
Pollutant
Effects
Agricultural
Industrial
Domestic
Source
Control Measures
Area
Agricultural
Industrial
Domestic
Pollutant
Slurry & Fertiliser
Sulphur dioxide
Plastic bags
................
................
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