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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...

    Price £3.00more info
  • 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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  • Environmental Studies Factsheet: 33. Coal-Fired Power Stations

    Environmental Studies Factsheet: 33. Coal-Fired Power Stations

      Coal mining in the UK remains in decline. However, we still managed to extract 29 million tonnes in 2002/3 – 17 million tonnes from deep mines and 12 million tonnes form open-cast s...

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  • Environmental Studies Factsheet: 34. Forests and Nutrient Cycles

    Environmental Studies Factsheet: 34. Forests and Nutrient Cycles

      Biological significance of forests • Forests encourage biodiversity by maintaining shelter, habitats and niches. Don’t confuse habitats – the place where an organism liv...

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  • Environmental Studies Factsheet: 35. Answering Exam Questions on Radioactivity

    Environmental Studies Factsheet: 35. Answering Exam Questions on Radioactivity

      The half-life of a radioactive isotope is the time it takes for half of the atoms of that isotope to decay. Most naturally occurring radioactive substances and many fission products are u...

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