| A | B |
|---|
| Fossil fuels | A fuel that may have been formed from the remains of prehistoric plants and animals. |
| Deforestation | The clearing or destruction of forests. |
| ozone | A gas formed from an interaction between oxygen ans sunlight. The layer in the earth's upper atmosphere that protects life beneath it by filtering out dangerous rays. |
| Photochemical smog | A type of air pollution produced by the ineraction of exhaust gases with sunlight. |
| Reforestation | A process by which forest are renewed through the planting of seed or young trees. |
| Desalinization | a process by which saltwater is changed into fresh water. |
| Acid rain | A type of polluted rain, produced when acids from smokestacks combine wiht water vapor, that can harm lakes, forests, and human health. |
| Crop rotation | a method of preserving soil fertility in which different types of crops are grown on the same piece of land over time. |
