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Physical Geography of Northern Africa
| Term | Definition |
|---|---|
| Delta | an area where sand, silt, clay, or gravel is dropped at the mouth of a river |
| Silt | small particles of rich soil good for farming |
| Wadi | a dry riverbed that fills with water when rare rains fall in a desert |
| Erg | a large area of sand |
| Nomad | a person who lives by moving from place to place in search of food |
| Phosphate | a chemical salt used to make fertilizer |
| aquifer | an underground layer of rock through which water flows |