| Word | Definition |
| Desalinization | Process used to make seawater drinkable |
| Emigrate | To move to another country |
| Dialect | Local form of a language that differs from the main language in pronounciation or the meaning of words |
| Refugee | Person who flees to another country to escape persecution or disaster |
| Economic System | System that sets rules for how people decide what goods and services to produce and how they are exchanged |
| Death Rate | Number of people out of every 1,000 who die in a year |
| Developing Country | Country that is working toward industrialization |
| Birth Rate | Number of children born each year for every 1,000 people |
| Acid Rain | Rain containing high amounts of chemical pollutants |
| Crop Rotation | Varying what is planted in a field to avoid using up all the minerals in the soil |
| Tariff | Tax added to the value of goods that are imported |
| Free Trade | Taking down trade barriers so that goods flow freely among countries |
| Ecosystem | Place where the plants and animals are dependent upon one another and their surroundings for survival |
| Import | To buy goods from another country |
| Culture | Way of life of a group of people who share similar beliefs and customs |
| Natural Resource | Product of the earth that people use to meet their needs |
| Nonrenewable Resource | Natural resources such as metals or minerals that cannot be replaced |
| Ethnic Group | People who share a common culture, language, or history |
| Renewable Resource | Natural resource that cannot be used up or can fairly quickly be replaced naturally or grown again |
| Population Density | Average number of people living in a square mile or square kilometer |
| Dictator | Individual who takes control of a government and rules the country as he or she wishes |
| Export | To trade goods to other countries |
| Monarchy | Form of government in which a king or queen inherits the right to rule a country |
| Famine | Lack of food |
| Erosion | Process of moving weathered materials on the earth's surface |
| Irrigation | Farming practice followed in dry areas to collect water and bring it to crops |
| Civilizations | Highly developed cultures |
| Conservation | Careful use of resources so they are not wasted |
| Urbanization | Movement to cities |
| Culture Region | Area of the world that includes many different countries that all have cultural traits in common |
| Cultural Diffusion | The process of spreading new knowledge and skills to other cultures |
| Quota | Number limit on how many items of a particular product can be imported from a particular country |
| Developed Country | Country in which a great deal of manufacturing is carried out |
| Pesticide | Powerful chemicals that kill crop-destroying insects |
| Deforestation | Widespread cutting of forests |
| Democracy | Form of government in which citizens choose the nation's leaders by voting for them |
