mountains

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Across
  1. 1. The thicker, less dense crust
  2. 3. Western North American Mountains
  3. 5. Area around the pacific ocean with much tectonic activity
  4. 7. Tallest in the world
Down
  1. 2. Eastern North American Mountains
  2. 4. The thinner, more dense crust
  3. 6. Made the Rocky Mountains
  4. 8. Mountains of Italy