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  • Environmental Studies Factsheet: 23. Reducing Noise Pollution

    Environmental Studies Factsheet: 23. Reducing Noise Pollution

      Noise causes stress and stress is a major cause of illness. Very loud noises cause permanent damage to hearing (Factsheet 130 Noise Pollution). The actual loudness of a sound is...

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  • Environmental Studies Factsheet: 24. The Chi-squared Test for Association

    Environmental Studies Factsheet: 24. The Chi-squared Test for Association

      The chi-squared test for association (or association index or chi-squared contingency tables) is commonly used in projects to measure whether two factors are associated (e.g. whether grea...

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  • Environmental Studies Factsheet: 25. Investigations: Basic Principles

    Environmental Studies Factsheet: 25. Investigations: Basic Principles

      A student decided to investigate the effect of zero cultivation on soil properties. They had read about an organic farmer who had not mechanically altered the soil in an arable field for ...

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  • Environmental Studies Factsheet: 26. GM Farm Scale Evaluation Trials

    Environmental Studies Factsheet: 26. GM Farm Scale Evaluation Trials

      In October 2003 the government announced the long-awaited results of its controversial farm scale investigations into GM crops. These were the trials that outraged environmentalists,...

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  • Environmental Studies Factsheet: 27. Biological Oxygen Demand

    Environmental Studies Factsheet: 27. Biological Oxygen Demand

      What is it? It is the amount of oxygen used by organisms in a body of water over a specified time period. By definition, aerobic organisms use oxygen in respiration. The more organi...

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  • Environmental Studies Factsheet: 28. Bauxite

    Environmental Studies Factsheet: 28. Bauxite

      Bauxite is an example of an ore – a rock that contains economically important quantities of a mineral. Bauxite contains several aluminium hydroxide minerals, from which valuabl...

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  • Environmental Studies Factsheet: 29. The Properties Of Pollutants

    Environmental Studies Factsheet: 29. The Properties Of Pollutants

      The older pesticides such as DDT, which are often incorrectly described as non-biodegradable, can be broken down but only very slowly; the half-life of DDT was 20 years. More mo...

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  • Environmental Studies Factsheet: 30. Spearman's Rank Correlation Coefficient

    Environmental Studies Factsheet: 30. Spearman's Rank Correlation Coefficient

      Spearman's Rank is one method of measuring the correlation between two variables. Correlation may be: • positive (large values of one variable associated with large values of the other v...

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  • Environmental Studies Factsheet: 31. Solar Energy

    Environmental Studies Factsheet: 31. Solar Energy

      Nuclear fusion in the sun releases a phenomenal amount of energy which reaches earth as shortwave radiation. There are a number of ways in which we try to harness this solar power di...

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  • Environmental Studies Factsheet: 32. Exam Questions on Aquifers

    Environmental Studies Factsheet: 32. Exam Questions on Aquifers

      Aquifers are rocks which have millions of microscopic pores that are filled with water. This is known as groundwater – it is in the ground – and it supplies us with about...

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