| A | B |
|---|
| prehistory | before time when writing was invented |
| archaeologist | scientists who examine objects about the past |
| history | period of time when things were written |
| oral tradition | stories that are passed down through word of mouth |
| nomad | people who had no single, settled home |
| fertile | soil that contains substances required to grow plants |
| domesticate | to tame animals |
| irrigation | a network of canals to supply land with water from another place |
| civilization | a society that has workers, cities, and government |
| surplus | more than needed |
| artisan | people skilled in making a craft |
| social class | when people are grouped by wealth, background and power |
