| A | B |
| Artisan | worker who is especially skilled at crafting items by hand |
| domesticate | to tame animals and breed them |
| Nomad | a person who has no settled home |
| History | written and recorded events of people |
| Old Stone Age | when almost all human prehistory took place |
| Farming | happened when people figured out how to irrigate land |
| Irrigation | supplying water through a network of canals |
| this led to the development of cities | having good sources of water |