| Term | Definition |
| desert | a barren region which receives little rain. |
| wadi | a desert river valley, which is usually dry but which fills during rainstorms. |
| flash flood | A sudden flow of water over what is usually dry land. |
| evaporates | to change from a liquid or a solid into a vapour. |
| porous | rock which is full of small holes into which water can soak. |
| silt | fine soil which is carried by moving water. |
| nomads | a member of a tribe that moves from place to place during the year. |
| dike | a bank built to control or hold back water |
| moslem | people who believe in God, follow the Koran, and pray many times a day. |
| Koran | the holy book of the moslems. |
| mosque | a holy building where men go to pray on Fridays. |
| Ramadan | the last month of the Arabic calendar, and it is the holy month for Moslems. |
| fast | to go without eating or drinking. |