G30

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Across
  1. 3. Upper layer supporting plants
  2. 4. Thick tropical vegetation
  3. 6. Floating ice chunk
  4. 9. Fertile soil layer
  5. 11. Semi-arid grassland
  6. 12. Deposited particles
  7. 14. Large ecological region
  8. 16. Thick polar ice cover
  9. 17. Large area of trees
  10. 19. Breakdown of rock
  11. 20. Dense tropical forest
Down
  1. 1. Organic soil matter
  2. 2. Open forest region
  3. 5. Sudden earth movement
  4. 7. Slow-moving ice mass
  5. 8. Rapid snow slide
  6. 10. Permanently frozen ground
  7. 13. Wearing away of land
  8. 15. Northern coniferous forest
  9. 18. Treeless polar plain