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Across
  1. 1. A group of mountains which do not stand in a line.
  2. 3. An extensive, level, usually treeless area of land.
  3. 4. A well-defined natural elevation smaller than a mountain, not higher than 600-700 m.
  4. 5. The lowest area between two mountains which allows the passage from one side to another.
  5. 6. An area of land standing between 200 m and 300 m above sea level. The surface is usually level, although it may sometimes be hilly.
  6. 8. A hollow of any size on a plain surface.
  7. 9. A huge mass of ice or snow.
  8. 11. The slope of a side of a mountain or mountain range.
Down
  1. 1. A natural elevation of the earth's surface having considerable mass, generally steep sides, and a height greater than that of a hill (usually more than 600-700 m).
  2. 2. A relatively large area of elevated or mountainous land standing more than 300 m above sea level.
  3. 5. A series of hills or mountains standing in a line.
  4. 7. A long depression in the land surface, usually containing a river, formed by erosion or by movements in the earth's crust.
  5. 10. The pointed summit of a mountain.