Across
- 2. - gas is being added at the atmosphere by cattle sheds
- 4. - the organisms that prepare their own food
- 7. - accumulation of non-biodegradable harmful substances in human beings and other animals
- 8. - A self supporting unit of living organisms and their non-living environment
- 9. - ozone is a molecule
Down
- 1. - responsible for the depletion of ozone
- 3. - ozone layer protects the earth from which radiation
- 5. - the process of burning the wastes at high temperature
- 6. - choke drain which result in water logging