| A | B |
|---|
| current | a flowing part of a river or stream |
| swell | to increase in size or volume |
| clog | to block up |
| steal | to take without permission |
| Mesopotamia | the region where the Tigris and Euphrates rivers flow |
| floodplain | the flat land bordering the banks |
| semiarid | The region has dry, hot summers |
| drought | a period when not enough rain and snow fall. |
| Irrigation | canals carry water from the rivers to farmers fields. |
| Surplus | more than is needed for oneself. |
