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environment
| Question | Answer |
|---|---|
| logging | cutting down trees in order to sell the wood |
| sewage | waste water and excrement conveyed in sewers |
| sewerage | the system by which waste matter is carried away in sewers and made harmless |
| crude oil | oil in its natural state before it has been processed or refined. |
| waste disposal | the process of collecting, treating, and safely disposing of unwanted materials like household, industrial, or agricultural waste |
| to decompose | to decay or cause to decay |
| decline | become less in quantity, importance, or quality. |
| run-off | rainwater that forms a stream rather than being absorbed by the ground. |