Russia, the Caucasus and Central Asia

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Across
  1. 4. Process by which fertile land becomes desert
  2. 5. People united by common descent, history, culture, or language, in a particular country or territory
  3. 6. Large area of flat unforested grassland
  4. 9. People that invaded Russia in the 1200s and ruled for 200 years
  5. 10. Viking created trading town
  6. 11. Prison labor camp
  7. 13. World's largest country in land area
  8. 14. European Slavic monarch similar to a king
  9. 15. Country including Russia and other central Eurasia states run by the Communist Party from 1922-1991
  10. 16. Reform of government and economy in the former Soviet Union
  11. 17. After World War II, the political and military tensions between the western democratic countries and the communist countries
  12. 18. An inland sea of Central Asia that has been steadily shrinking
Down
  1. 1. Divides the east European plain from the West Siberian plain
  2. 2. The Arctic and subarctic region of Central Asia that extends from the Ural Mountains to the Pacific Ocean
  3. 3. Forest that grows in wet ground in the northern regions of the earth
  4. 7. Layer of soil that remains frozen throughout the year
  5. 8. Largest river in Europe
  6. 12. Deepest lake on earth
  7. 14. Site of 1986 nuclear reactor accident