crossword higher secondary

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Across
  1. 2. The transitional zone between two distinct communities
  2. 6. The largest living organism
  3. 7. relating to farming food without using chemicals
  4. 10. the process by which an unstable atomic nucleus loses energy by radiation
  5. 13. the destruction of waste materials by burning.
  6. 14. A mixture of smoke and fog
  7. 15. A type of soil which retains water and is always damp
Down
  1. 1. Species seriously at risk of extinction
  2. 3. the increase in concentration of toxins up the food chain
  3. 4. Underground layer of water-bearing permeable rocks
  4. 5. process that converts biomass or carbonaceous materials into gases
  5. 8. an organism whose genome has been altered by the introduction of foreign DNA from another species artificially
  6. 9. Supplying dry land with water by means of ditches etc
  7. 11. Mixture of or decaying organic material
  8. 12. The wave energy released by earthquakes