| Episode |
3-2-1 Contact Growth/Decay: Human Cultures/Land Forms |
1980 |
| Episode |
3-2-1 Contact Growth/Decay: Cycles Upon Cycles |
1980 |
| Episode |
3-2-1 Contact Surfaces: Surface of the Earth |
1980 |
| Episode |
3-2-1 Contact Hot/Cold: How Hot or Cold Can It Get? |
1980 |