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Chapter 19.3

Chapter 19.3. Pollution and Recycling. What Causes Pollution?. Pollution is the contamination of air, water, or soil. What Causes Pollution?. Pollution can be caused by natural causes -volcanic eruption fills air with dust and ash. What Causes Pollution?.

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Chapter 19.3

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  1. Chapter 19.3 Pollution and Recycling

  2. What Causes Pollution? Pollution is the contamination of air, water, or soil

  3. What Causes Pollution? Pollution can be caused by natural causes -volcanic eruption fills air with dust and ash

  4. What Causes Pollution? Most pollution is caused by human activities -reactions create products that if not used properly, add to the pollution problem

  5. Air Pollution Air pollution comes in many forms -individual molecules to clumps of dust and matter , called particulates

  6. Air Pollution Burning of fossil fuels produces energy, along with carbon dioxide and water vapor -escape into air as invisible gases

  7. Air Pollution Carbon dioxide is found naturally in the atmosphere -greenhouse gas that helps keep Earth’s temperature balanced -without it, Earth’s temperature would be about 33 degrees lower -humans put billions of tons into the air each year

  8. Air Pollution -burning of fossil fuels also releases sulfur dioxide and nitrogen dioxide into the air -react with other atmospheric gases to form acid rain -makes streams and lakes acidic -can harm or kill aquatic life -can acidify soil -corrode metals and stone buildings

  9. Air Pollution -nitrogen oxide can react with sunlight to form photochemical smog -brown haze that stings eyes and cause severe headaches and breathing difficulties -most common in sunny, densely populated cities

  10. Water Pollution -most water pollution can be traced to industrial waste, agricultural fertilizers, and everyday human activities -fertilizers get washed away by rain into lakes and rivers -contain nitrate ions, which encourage growth of bacteria and algae

  11. Water Pollution -feeding on the nitrates, bacteria and algae grow so fast that they use up most of the oxygen in the water -algal bloom -kills fish and other aquatic wildlife -process is called eutrophication

  12. Water Pollution -pesticides can be washed into lakes and rivers by rain -eaten by fish and other aquatic animals -passed along food chain

  13. Land Pollution -a common type of land pollution occurs when hazardous chemicals soak into the soil.

  14. Reducing Pollution -government regulation discourages pollution of air, water, and land -use of alternative energy and conserving energy can reduce pollution

  15. Reducing Pollution -recycling allows materials to be used again rather than being thrown away -saves landfill space and conserves scarce resources

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