| of streams | 10 | location |
| due to man-made sources | 2 | cause |
| acid rain → be → caused | 10 |
| acid rain → can → cause | 9 |
| acid rain → cause → acidity | 6 |
| negative | neutral | positive |
| 0.752 | 0.236 | 0.012 |
| Raw frequency | 25 |
| Normalized frequency | 0.693 |
| Modifier score | 0.500 |
| Perplexity | 118.534 |