| Title | Comment | Keywords |
|---|---|---|
| Analyzing Rocks | 13:29 - 14:51 (01:22) / 1.6 MB | "J. Lawford Anderson", petrologist, granite, "Whipple Mountains", "Colorado River", California, "rock age", "rock origin", crust, "laboratory analysis", mineral, "chemical composition", "rock slab", "thin section", microscope, mineral, intergrowth |