Across
- 3. bathing, flushing toilet and washing are some ways which produce
- 4. when the drainage pipe and drinking pipe are close and the leak can make the water
- 6. matter discharged into water bodies uses up substantial oxygen dissolved in water
- 7. stagnant water in blocked drains is a good breeding place
Down
- 1. wasterwater contains microorganisms
- 2. new method use red worm to treat human excreta
- 5. microorganisms that can cause diseases
- 8. solid matter produced by sewage treatment
- 9. waste water from houses, industries that runs over land containing waste matter