Across
- 4. Separation method used in water treatment to remove insoluble solids.
- 6. Greenhouse gas released by animal waste
Down
- 1. Process used in water treatment to kill microbes.
- 2. Gas responsible for global warming produced by complete combustion.
- 3. Type of water used in practical chemistry because it contains fewer impurities.
- 5. Element represented by the symbol O.
- 7. Rain made acidic mainly by sulfur dioxide and nitrogen oxides.
