| A | B |
|---|
| Silt | small particles of rich soil |
| alluvial plain | area built up by rich fertile soil left by river floods |
| sedimentary rock | type of rock formed when layers of sediment, or dirt from the ocean floor, are compresses together and harden |
| phosphate | chemical salt used to make fertilizer |
| poaching | illegal fishing or hunting |
| refinery | facility that turns petroleum into gasoline and other produce |
| wadi | dry river bed that fills with water when rare rains fall in the desert |
| erg | large areas of soft and dunes in the sahara |
| oasis | fertile area that rises in a desert where water is regularly available |
| aquifer | underground layer of rock through which water flows |
| rationing | making a resource available in limited amounts |
| disalinization | process by which dry areas turn in to desert |
| benefit | somthing that does good to a person or thing |
| stable | firmly established; not likely to change suddenly or greatly |
| source | a point where something begins |
| shift | to change from one to another |
| stucture | an argument of part |
| suffrage | right to vote |
| sisal | plant fiber used to make rope and twine |
| genocide | mass murder of people about the same age ago |
