| A | B |
|---|
| natural resource | any useful material found in the environment |
| raw materials | resources that must be altered, or changed, before they can be used |
| recyclable resource | a resource that cycles through natural processes in the environment |
| renewable resource | a natural resource that the environment continues to supply or replace as it is used |
| nonrenewable resource | a resource that cannot be replaced once it is used |
| fossil fuel | any one of several nonrenewable resources such as coal, oil, or natural gas created from the remains of plants and animals |
| manufacturing | the process of turning raw materials into a finished product |
| developed nation | a country with amodern industrial society and a well-developed economy |
| developing nation | a country with relatively low industrial production, often lacking modern technology |
| commercial farming | farming that is done by companies |
| subsistence farming | the practice of growing only as much food as a group of people needs to survive |
| plantation | a large, usually one-crop farm with many workers living on it |
| foreign aid | economic and military aid to another country |
| ecosystem | a community of living things and their environment |
| deforestation | the process of clearing land of forests or trees, usually to make room for farms and homes |
| habitat | the area in which a plant or an animal naturally grows or lives |
| acid rain | rain whose high levels of chemicals can pollute or damage the environment (usually caused by the burning of fossil fuels) |
| ozone layer | the layer of gas in the upper part of the atmosphere that blocks out most of the sun's ultraviolet rays |
| global warming | a slow increase in Earth's temperature due to the increasing amount of carbon dioxide in the atmosphere |
| recycle | to reuse materials to make new products |
