| A | B |
|---|
| history | the period of the past for which written records exist |
| nomadic | wandering from place to place in search of food |
| prehistory | the period of time before human beings could write |
| Lascaux | a cave in southwestern France with a series of 17,000-year-old paintings and engravings |
| agricultural revolution | the giant step forward that humans took when they deliberately planted seeds to grow crops |
| domestication | the practice of taming wild animals |
| slash-and-burn agriculture | a method of preparing land for farming by slashing the bark of trees to kill them, and then burning the brush and scattering the ashes |
| Sumer | first known civilization in the world |
