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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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  • Environmental Studies Factsheet: 36. The Paired t-Test & When To Use It

    Environmental Studies Factsheet: 36. The Paired t-Test & When To Use It

      The t-test is widely used within investigation work. This Factsheet will tell you when and how to use the paired t-test. Hypotheses The t-test is used to compare two means (the mean is the n...

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  • Environmental Studies Factsheet: 37. Greenhouse Effect & Kyoto Update

    Environmental Studies Factsheet: 37. Greenhouse Effect & Kyoto Update

      Greenhouse effect basics: • Incoming radiation from the sun warms the Earth’s surface • The Earth’s surface re-radiates energy back to space as infrared radiation &bul...

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  • Environmental Studies Factsheet: 38. Breeding: The Dairy Cow

    Environmental Studies Factsheet: 38. Breeding: The Dairy Cow

      There are about 12 million cattle in the UK, which are raised either for milk or beef. Breeding cows or any other domestic animal or crop involves a series of decisions. The first qu...

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  • Environmental Studies Factsheet: 39. CITES

    Environmental Studies Factsheet: 39. CITES

      What is it? An international agreement between governments of 160+ countries. Joining is voluntary but, once joined, a country has to agree to the rules. The aim is to make sure trade in...

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