waste management

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Across
  1. 4. the process turns organic waste into nutrient-rich soil
  2. 6. facility where waste is buried in the ground
  3. 7. material is commonly recycled and made from sand
  4. 8. substance discarded after primary use, or is worthless, defective and of no use
Down
  1. 1. approach aims to eliminate all waste, making everything reusable
  2. 2. Turning waste materials into new products of higher quality or value
  3. 3. symbol with three chasing arrows, representing recycling
  4. 5. This gas, often associated with landfills, contributes to the greenhouse effect