Beat the Flood

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Across
  1. 4. Material which can be poured into any shape
  2. 6. A realistic method of drawing
  3. 12. Any three dimensional form which can support weight
  4. 13. A strong and flexible natural building material
  5. 15. Metal which is good for roofing
  6. 16. Waterproof material suitable for wrapping around other materials
  7. 17. A plant that can be used for roofing
  8. 20. Waterproof, strong but heavy material
Down
  1. 1. Waterproof but brittle material, good for windows
  2. 2. South Asian country which suffers severe flooding
  3. 3. A process which is causing increased flooding around the world
  4. 5. European country which suffers severe flooding
  5. 6. A condition of life which makes it much harder to cope with disasters like flooding
  6. 7. Thick plastic which can be bent into curves
  7. 8. A structure that is cheap and easy to construct
  8. 9. A style of roof which is not suitable for areas with heavy rainfall
  9. 10. A way of elevating a building off the ground
  10. 11. Strong but absorbent building material
  11. 14. The act of using ideas from nature when designing
  12. 18. A structure where the materials are combined into a single form
  13. 19. Dense material from deciduous trees