Environmental sanitation

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Across
  1. 3. economic activity concerned with the processing of raw materials and manufacture of goods in factories
  2. 5. a mixture of water and solid waste carried away in drains
  3. 7. the waste that does not decays easily in short period of time
  4. 8. a chemical or natural substance added to soil or land to increase its fertility.
Down
  1. 1. decayed organic material used as a fertilizer for growing plants
  2. 2. the waste that decays easily in a short period of time
  3. 4. ornaments and articles made from glass.
  4. 6. the presence in or introduction into the environment of a substance which has harmful or poisonous effects