Unit 7 Crossword Puzzle

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Across
  1. 4. amphibians are ____ because they are highly sensitive to change in their environment
  2. 8. urban runoff is an example of
  3. 10. protects life on Earth from the Sun's ultraviolet (UV) radiation
Down
  1. 1. paints are common sources of ____
  2. 2. an example of _____ is the BP oil spill
  3. 3. mercury found in fish that later effects humans
  4. 5. can cause damage to humans respiratory system
  5. 6. ozone is found in ___
  6. 7. lead is found in ___
  7. 9. Mexico has so much ____ due to population increase, industrialization, and increased vehicle use