| Title | Comment | Keywords |
|---|---|---|
| Flow of Groundwater | 07:15 - 07:36 (00:21) / 0.6 MB | groundwater, cave, geologist, "water flow", spring, river, "Earth's surface", flood |
| Springs | 09:10 - 09:37 (00:27) / 1.7 MB | groundwater, "water flow", "Earth's surface", joint, fault, spring, season |