| A | B |
|---|
| tributary | a stream that flows into a larger stream or body of water. |
| valley | low land between hills or mountains. |
| climate | the weather that a place has over a long period of time. |
| temperate zones | the part of the earth’s surface that lays between the Tropic of Cancer and the Arctic Circle in the Northern Hemisphere and between the Tropic of Capricorn and the Antarctic Circle in the Southern Hemisphere. |
| tropical zones | the low latitude zone that reaches 23½° north and south of the equator; the area of the earth’s surface that lays between the Tropic of Cancer and the Tropic of Capricorn. |
| polar zones | the areas of the earth’s surface that lay north of north latitude 66½° and south of south latitude 66½°. |
| population | the people of a city, country or district; the number of people. |
| urban | refers to living in cities or towns; of or having to do with cities or towns. |
| rural | refers to living in the country; of our having to do with the country. |
| zero population growth | a term that indicates that the number of people in an area doesn’t increase. |
| migration | the movement of people or animals from one place to another. |
| culture | the customs, arts, and conveniences of a nation or people at a given time; a people’s way of life. |
| environment | all the surrounding things, conditions, and influences affecting the growth of living things. |
| habitat | a place where an animal or plant naturally lives or grows. |
| desertification | the loss of all vegetation; the transformation of arable land into desert either naturally or through human intervention. |
| deforestation | the process of striping the land of its trees. |
| famine | the lack of food in a place; a time of starvation. |
| adapt | to make fit or suitable; adjust. |
| basic needs | the things one needs to survive; necessities. |
| fossil fuels | any one of several nonrenewable mineral resources such a coal, oil, or natural gas which are formed from the remains of ancient plants and animals and used for fuel. |
