| A | B |
|---|
| Savanna | grassland ecosystem |
| desertification | process by which fertile land becomes desert |
| Sahel | semi-arid region south of the Sahara Desert |
| Rainforest | dense forest found in cenral Africa |
| Natural Resources | materials found in nature that people use |
| Subsistence farming | growing food mainly to feed one's family |
| Cash Crops | crops grown to be sold for profit |
| Nomadic | moving from place to place in search of water and grazing land |
| Drought | a long period with little or no rainfall |
| Irrigation | supplying water to crops |
| Minerals | valuable natural substances like gold, copper |
| Urbanization | growth of cities as people move from rural to urban areas |
| Infrastructure | basic systems like roads, bridges, electricity |
| Trade | exchange of goods and services between people |
| Exports | goods sold to other countries |
| Imports | goods purchased from other countries |
| Economic Development | improvement in a country's wealth and quality of life |
| Agriculture | Farming, including growing crops and raising animals |
| Renewable Resources | Natural resources that can be replaced, such as sunlight and wind |
| Nonrenewable Resources | resources that cannot be replaced quickly, like oil or minerals |
| Climate | the usual weather conditions of a region over time |
| Population Density | the number of people living in a certain area |
| Deforestation | cutting down forests faster than they can regrow |
| Tourism | Travel for pleasure that supports local economies |
| Sustainable Development | Using resources responsibly so future generations can also benefit |
