| 1 | Soil acidification can be the result of acid rain. | |
| 2 | These compounds are the main cause of acid rain. | |
| 3 | Soil acidification can be the result of acid rain. | |
| 4 | Floods, draughts, acid rain...,these are the punishments from nature. | |
| 5 | We used to often hear about acid rain and almost everyone knows that acids are dangerous. |
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