What's So Good about Mountains?

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Across
  1. 2. rising or falling quickly, not gradually
  2. 5. a river of ice
  3. 6. producing a successful result
  4. 9. the height above sea level
  5. 10. the top of the mountain
  6. 11. a line or group of mountains
Down
  1. 1. a series of events being repeated many times, always in the same order
  2. 3. a flat, hard area
  3. 4. an area of low land between hills or mountains
  4. 7. steam
  5. 8. a surface that it higher at one end than the other