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Climate and the Environment in Russia
| Term | Definition |
|---|---|
| permafrost | permanently frozen lower layers of soil found in the tundra and subarctic climate zones |
| taiga | large coniferous forests |
| smog | thick haze of smoke and chemicals |
| pollutant | chemical and smoke particles that cause pollution |
| period | a portion of time |
| decline | a change to a lower state or level |