Geography

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Across
  1. 2. South American country
  2. 4. Type of rock
  3. 6. Center of Texan oil industry
  4. 8. River of ice
  5. 10. Longest river in Russia
  6. 11. Capital of Australia's Northern Territories
  7. 13. Capital of Peru
Down
  1. 1. Caribbean and Pacific are examples
  2. 3. Sea off Canadian coast
  3. 5. Country with Dead Sea coast
  4. 7. Inclined land under 1000 feet from base
  5. 9. Country containing Timbuktu
  6. 12. Chinese city