| Title | Comment | Keywords |
|---|---|---|
| Acid Rain | 11:11 - 12:01 (00:50) / 2.3 MB | "James Sadd", weathering, "chemical weathering", "parent rock", "industrial age", "carbon dioxide", "nitrogen oxide", "sulfur dioxide", atmosphere, "fossil fuel", forest, pollution, gas, rainfall, precipitation, "Earth's surface", "acid rain" |