| A | B |
|---|
| Fertile | Containing substances that plants need in order to grow well |
| Savanna | Region of tall grasses |
| Diversity | To add variety - a country can diversify its economy by producing more products |
| Nomad | A person who moves around to make a living, usually herding animals, trading, hunting or gathering |
| Oasis | A fertile place in a desert where there is water and vegetation |
| Economy | A system for producing, distributing , consuming and owning goods |
| Tributary | A small stream or river that flows into a larger river |
| Cash Crop | A crop that is raised for sale |
| Cataract | A rock filled rapid |
| Subsistance Farming | Raising just enough crops to support ones family |
| Escarpment | A steep cliff about 100 stories high |
| Silt | Bits of rock and dirt on the river bottom |
| Plateau | A large, mostly flat area that rises above the surrounding land |
| Rift | A deep crack in the Earth's surface |
| Elevation | The height of land above sea level |
| Irrigate | To artificially water crops |
