| A | B |
|---|
| erosion | wind or water carrying soil away |
| desalinization | removing salt from seawater |
| conservation | careful use of resources so they are not wasted |
| pesticides | chemicals that kill crop-destroying insects |
| acid rain | rain containing high amounts of chemical pollutants |
| ecosystem | place where plants and animals are dependent on each other |
| industries and vehicles | main sources of air pollution |
| deforestation | cutting down forests |
| crop rotation | avoid using up soil minerals |
| warm | increasing amounts of pollutants in atmosphere |
