Collapse of civilizations

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Across
  1. 6. The gradual process of civilizations disappearing over time
  2. 7. Lack of resources contributing to the collapse of civilizations
Down
  1. 1. Outside groups influencing the fall of the Roman Empire
  2. 2. Ancient civilization in Central America known for its astronomy
  3. 3. Type of ancient architecture associated with the Anasazi
  4. 4. The century when the Mayan civilization collapsed
  5. 5. Ancient South Asian civilization with major sites in Harappa