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Across
  1. 3. - Large political entity encompassing multiple territories
  2. 5. - Freedom from outside control or rule
  3. 7. - Armed conflict between nations or groups
  4. 8. - Belonging to a time long past
  5. 11. - Armed conflict between nations or groups
  6. 12. - Act of setting someone free from slavery or oppression
  7. 13. - Advanced society with complex social structures
  8. 14. - System of government led by a king or queen
  9. 15. - Succession of rulers from the same family
Down
  1. 1. - Substance with a distinct composition and properties
  2. 2. - Overthrow of a government or social system
  3. 3. - Traveling to new lands to discover and map unknown territories
  4. 4. - Global conflict involving many nations
  5. 6. - State of political tension between major powers after World War II
  6. 8. - Study of celestial objects and the universe
  7. 9. - Study of heredity and genetic variation
  8. 10. - Succession of rulers from the same family
  9. 12. - Study of the interactions between organisms and their environment