| A | B |
|---|
| silt | a mixture of tiny bits of soil and rock carried by rivers |
| drought | a long period of dry weather |
| levee | a wall built along a river to prevent flooding |
| irrigation | watering of dry land by means of canals or pipes |
| erosion | gradual wearing away of soil and rock by wind, etc. |
| cuneiform | a system of writing thqt uses wedgeshaped symbols |
| scribe | a writer who kept records and copied things |
| city-state | a self-governing city |
| ziggurat | a large pyramid with several stories--often had a temple on top |
| polytheism | belief in many gods |
| empire | a group of lands and people ruled by one government |
