Periodisation of world history

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Across
  1. 3. =modern,belonging to the same or a stated period
  2. 4. the activities involved in buying and selling things
  3. 7. the ancient past
  4. 8. a change in the way a country is governed, usually to a different political system and often using violence or war
  5. 9. something that has never been made before
  6. 10. something that is very dangerous
  7. 13. a new growth of activity or interest in something, especially art, literature, or music
  8. 14. the state of knowing about or being familiar with something
Down
  1. 1. the increase in something's speed, or its ability to go faster
  2. 2. an amount of something that has been collected
  3. 5. human society with its well developed social organizations, or the culture and way of life of a society or country at a particular period in time
  4. 6. a male ruler of an empire
  5. 10. a length of time
  6. 11. a calculation that you make
  7. 12. a period of 100 years
  8. 15. the period in the 18th century in Europe when many people began to emphasize the importance of science and reason, rather than religion and tradition