Lesson 11 Summary

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Across
  1. 1. The provision of clean drinking water and adequate human waste disposal.
  2. 3. An internal mechanism of the body that regulates physical and mental functions in rhythm with normal daily activities.
  3. 6. the introduction of hazardous substances into the environment.
  4. 7. The amount of carbon dioxide and other greenhouse gases caused by a particular person or group.
  5. 9. The environment that is specific to you.
  6. 10. The environment that extends beyond national boundaries.
Down
  1. 2. rain with an increased acidity (lower pH) due to pollutants in the air (usually nitrate and sulfates)
  2. 4. A gas that contributes to climate change, also known as the greenhouse effect.
  3. 5. The environment that is shared, up to the national level.
  4. 8. An increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect.