matthews fold mountains

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Across
  1. 2. what happens to rocks under pressure (8)
  2. 4. Macgillycuddy mountain range (5)
  3. 7. mountain range in North America (7)
  4. 9. high fold mountains in Europe (4)
  5. 12. upward ridge or fold of rock (9)
  6. 13. fold mountains formed 250 million years ago (9)
  7. 14. Armorican mountains in Ireland (7)
  8. 16. mountains form when land is pushed upward (4)
  9. 17. another Armorican mountain range (14)
Down
  1. 1. plates collide and cause folding (10)
  2. 2. oldest fold mountains, formed 400 million years ago (10)
  3. 3. ocean floor material squeezed into folds (9)
  4. 5. worn down over time, leaving rounded peaks (6)
  5. 6. mountain range in Munster (9)
  6. 8. downward fold between ridges (8)
  7. 9. plate that collided with Eurasian Plate (7)
  8. 10. Irish location of Caledonian mountains (7)
  9. 11. another Irish Caledonian range (7)
  10. 15. tallest fold mountains in Asia (9)
  11. 18. youngest and tallest fold mountains (6)