| Title | Comment | Keywords |
|---|---|---|
| Continental Drift | 02:46 - 03:44 (00:58) / 0.5 MB | "Alfred Wegener", "Robert Douglas", "continental drift", "Atlantic Ocean", Africa, "South America", continent |
| Significance of Plate Tectonic Theory | 21:58 - 22:40 (00:42) / 0.4 MB | "Robert Douglas", "plate tectonics", evolution, theory, crust |
| Plate Tectonics Revolution | 25:06 - 25:47 (00:41) / 0.5 MB | "Robert Douglas", "plate tectonics", Earth, geology, theory, "environmental system" |