| A | B |
|---|
| silt | small particles of rich soil |
| alluvial | an area of fertile soil left by river floods |
| sedimentary rock | rock created when layers of material are hardened by intense weight |
| phosphates | mineral salts used to make fertilizer |
| poaching | illegal fishing or hunting |
| refineries | facilities that turn petroleum into gasoline and other products |
| wadis | dry riverbeds |
| ergs | large areas of soft sands in the desert |
| oases | fertile land in the Sahara, due to a water source |
| nomads | people who move to different areas to find food and water |
| dry farming | a method in which land is left unplanted every few years |
| aquifers | underground rock layers through which water flows |
| rationing | dealing with water shortages |
| desalinization | seawater is treated to remove salts and minerals |
