Across
- 5. Degradation of a natural environment by toxic substances or waste.
- 7. Polymeric materials
- 8. An area of salt water covering most of the Earth
- 9. Oxygen-free zone where people die of asphyxiation
Down
- 1. Reuse waste
- 2. Cultivate the land.
- 3. Scrap, residue
- 4. An organised collection of living and non-living elements in a natural environment.
- 6. Gas essential for breathing
- 8. Organism with a new or improved characteristic.