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Topic 5 – Continued… November 9, 2010

Topic 5 – Continued… November 9, 2010. Pollution in the Environment Science 7 Page 52. Pollution in the Environment.

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Topic 5 – Continued… November 9, 2010

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  1. Topic 5 – Continued… November 9, 2010 Pollution in the Environment Science 7 Page 52

  2. Pollution in the Environment • Pollution occurs when a substance is added to the environment at such a fast rate that it cannot be broken down, stored or recycled in the air, land, or water in a non-damaging form.

  3. Pollution in the Environment • Pollutants are substances that cause pollution.

  4. Pollution in the Environment

  5. Pollution in the Environment • Many substances occur naturally in the environment become pollutants because they are present in high concentrations. • Carbon dioxide is found naturally in our environment but the excess is damaging the environment

  6. BrainPOP! • Air Pollution

  7. The Movement of Pollution • Many harmful substances move through our environments • Examples: • PCBs – was used in paints and packaging materials; break down slowly and harm organisms • Mercury – industries; cause deformities in organisms

  8. DDT • What is it? • dichlorodiphenyltrichloroethane • Synthetic pesticide • Made in a chemistry lab • Used to kill pests after WWII • Very effective at killing mosquitoes • Advertised as “Safe for Everyone”

  9. -DDT use in the 1940-1960s -Banned in the 1970s -stilled used to kill pests in areas where diseases are persistent (Malaria)

  10. Poisons cause deformities in frogs

  11. Bioaccumulation • Accumulation of pollutants/toxins in a food web

  12. Bioaccumulation • Pollutants enter in the lower levels of the food web and increase or accumulate as you move up the web

  13. Bioaccumulation • For example, a robin takes in all the pollutants that the worms ate, then a falcon eats all the poison both the worms and robin ate.

  14. Assignment • Page 54 • Complete question # 1 to 5 • To be handed in!

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