Major landforms of the earth

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Across
  1. 3. - variety of plants
  2. 6. - wearing away of earth's surface
  3. 7. - lower part of block mountain
  4. 9. - plateau rich in black soil
  5. 11. - washed surface rebuilts again
  6. 12. - mountains arranged in a line
Down
  1. 1. - farming, construction
  2. 2. - storehouse of water
  3. 3. - variety of animals
  4. 4. - plateus famous for gold, diamond
  5. 5. - rivers of ice
  6. 8. - mineral deposits
  7. 10. - upper part of block mountain