Mountains!

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Across
  1. 1. A low area between mountains, often used for crossing
  2. 3. The highest point of mountain
  3. 4. Mountains are Formed by faulting and uplift
  4. 7. Mountains Formed by uplift of the Earth's crust
  5. 8. Mountains Formed by volcanic eruptions
  6. 9. Relating to high mountain regions
  7. 11. The surface or side of a mountain
Down
  1. 2. The height of a mountain above sea level
  2. 3. Dangerously high or steep
  3. 5. The lowest part of a mountain, where it meets the surrounding land
  4. 6. A long, narrow strip of high ground, often forming a backbone of a mountain range
  5. 8. A low area between hills or mountains, typically with a river or stream flowing through it
  6. 10. Mountains Formed by the folding of Earth's crust