Across
- 4. The waste matter that passes through sewers.
- 7. The breaking down or destruction of a material, especially a metal, through chemical reactions.
- 10. A type of harvesting where water is captured and stored in bore wells,pits and wells.
- 11. The conversion of bare or cultivated land into forest.
- 13. A species present in such small numbers that it is at risk of extinction.
Down
- 1. The act or process of polluting or the state of being polluted, especially the contamination of soil, water, or the atmosphere by the discharge of harmful substances.
- 2. The layer of a gas at the upper atmosphere containing relatively high levels of Oxygen.
- 3. A suspension of fine solid or liquid particles(by burning of fossil fuels) in a gaseous medium.
- 4. Of or concerning conditions or arrangements that encourage good health.
- 5. Substances that contaminate air, water or soil.
- 6. It is the physical growth of urban areas as a result of rural migration and even suburban concentration into cities, particularly the very large ones.
- 8. Capable of being decomposed by a biological agent.
- 9. The removal of a forest or stand of trees where the land is thereafter converted to a non-forest use.
- 12. Any substance used to fertilize the soil.