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Across
  1. 5. (adj) causing little or no damage to the environment and therefor able to continue for a long time
  2. 7. (n) rainwater that falls impermeable surfaces and can be collected for watering
  3. 11. (n) distinct ecosystem that is flooded by water - either permanently or seasonally
  4. 12. (n) the process of land degradation (for instance through over-farming or tree removal) such that it becomes dry and infertile
  5. 15. (n) another word for a bush
  6. 16. (n) a wild plant that grow unwanted in your planting bed (as a verb: to undertake their removal)
  7. 17. (n) the process of removing salt from seawater
  8. 19. (n) small rounded stones used in drainage or as a finish for paths
  9. 20. (n) a specific area of ground – for building or a habitat
  10. 21. (n) a place at the centre of activity – often use to describe a transport node
  11. 22. (n) something that is intended to make life more pleasant or comfortable or convenient for the people – for instance a park/ a public transit system
  12. 23. (n) the (arguably) inborn affinity/ love human beings have for other forms of life
  13. 24. (adj) connected with the countryside - opposite of urban
  14. 25. (adj) synonym: rare or in short supply
  15. 26. (n) the science or practice of planting and taking care of trees and forests
Down
  1. 1. (adj) the quality of a material that does not allow water to go through it
  2. 2. (n) uniformity: the quality of consisting of parts or people that are similar to each other or are of the same type
  3. 3. (adj) describes a landscape that is unable to produce plants or fruits: synonym infertile
  4. 4. (n) the process of making land that is underwater or in poor condition suitable for building or farming
  5. 6. (n) the practice of supplying land with water so that crops and plants will grow
  6. 8. (n uncountable) the leaves of a plant or tree: greenery, foliage
  7. 9. (n) synonym: relaxation/ leisure/ free-time pursuits
  8. 10. (n) the process by which people leave the countryside to live in cities
  9. 13. (adj) peoples or plants belonging to a very specific place: synonym: native
  10. 14. (adj) the quality of a material that does not allow water to go through it
  11. 18. (n) a layer of rock/ sand/ earth that contains water or allows water to pass through it