Urbanization

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Across
  1. 2. artificial human-made system of watering crops
  2. 5. point where two or more lines interconnect
  3. 8. what humans lived as for most of their time on Earth
  4. 9. when cities start to spread out into the surrounding rural areas
Down
  1. 1. lifestyle characterized by moving place to place
  2. 3. where the world's earliest cities developed near
  3. 4. things like roads, buildings, electrical grids
  4. 6. where cities started to appear in the U.S. after the Transcontinental Railroad
  5. 7. places where people started to work during industrialization
  6. 9. the introduction of agriculture allowed for a food ___