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

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Area

Pollutant

Effects

Agricultural

Industrial

Domestic

Source

Control Measures

Area

Agricultural

Industrial

Domestic

Pollutant

Slurry & Fertiliser

Sulphur dioxide

Plastic bags

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