| A | B |
|---|
| desalinization | the process of removing salt from sea water |
| conservation | the careful use of resources so they are not wasted |
| pesticides | powerful chemicals that kill crop-destroying insects |
| ecosystem. | places where plants and animal are dependent upon one another - and their particular surroundings - for survival |
| crop rotation | changing what is planted in a field to avoid using up all the minerals in the soil |
| irrigation | delivering water to crops |
| erosion | when wind and water carries away the soil from a field |
| deforestation | widespread cutting-down of forests |
| acid rain | rain containing high amounts of chemical pollutants |
| air pollution | industries and vehicles that burn fossil fuels are the two main sources of |
| global warming | Some scientists believe that the accumulation of greenhouse gasses may lead to |
| 11% | What percentage of the earth's land is arable or suitable for farming |
| pollution | putting impure or poisonous substances into the land, water, or air. |
