Nature & Structure

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Across
  1. 4. A leaf’s line pattern
  2. 5. A building block
  3. 6. A manmade building
  4. 9. A winding root
  5. 10. A tall natural structure
Down
  1. 1. A tiny stone
  2. 2. Green and leafy
  3. 3. A home for birds
  4. 7. A natural shelter
  5. 8. A strong material