Environmental Science

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Across
  1. 3. planting different crops to prevent erosion
  2. 7. two primary atmospheric gases
  3. 8. harmful substance in the air
  4. 10. can not renew
  5. 11. when hydrocarbons and nitrogen oxides react
Down
  1. 1. a renewable source from the sun
  2. 2. reduce erosion by 75%.
  3. 4. we breathe it
  4. 5. two primary atmospheric gases
  5. 6. rocks removed from the ground
  6. 9. solid waste leftovers