| 1980's-90's car name | 28 |
| ''World'' prefix | 32 |
| ''Earth'' word form | 35 |
| _____ Prism | 11 |
| ___ Metro (bygone car) | 22 |
| Crystal-lined rock | 18 |
| Crystal-lined stone | 19 |
| Hollow stone | 12 |
| Hollow rock | 11 |
| Crystal-filled rock | 19 |
| Rock cavity | 11 |
| Sparkly rock | 12 |
| Nodule of stone | 15 |
| Glittery stone | 14 |
| Glittery rock | 13 |
| Crystalline stone | 17 |
| Crystal-bearing rock | 20 |
| Crystal rock | 12 |
| Iowa's state rock | 21 |
| Crystalline rock | 16 |
| Crystal-filled stone | 20 |
| Crystal-filled nodule | 21 |
| Sparkly stone | 13 |
| Round stone | 11 |
| Rock containing crystal | 23 |
| It may be lined with quartz | 27 |
| Crystal-lined cavity | 20 |
| Thunder egg | 11 |
| Stone with crystals | 19 |
| Stone lined with crystals | 25 |
| Sparkly paperweight | 19 |
| Sparkly collectible | 19 |
| Show-and-tell rock | 18 |
| Shiny, hollow paperweight | 25 |
| Rock-shop curiosity | 19 |
| Rock with crystal center | 24 |
| Rock with a glittery inside | 27 |
| Rock with a crystal inside | 26 |
| Rock that's glittery inside | 31 |
| Quartz-filled rock | 18 |
| Natural sparkler | 16 |
| Mineral-containing stone | 24 |
| Keeper for a rock collector | 27 |
| It has a crystal inside | 23 |
| Hollow, crystal-filled rock | 27 |
| Hollow, crystal-containing rock | 31 |
| Hollow rock with crystals | 25 |
| Hollow nodular stone | 20 |
| Hollow crystalline rock | 23 |
| Globular stone | 14 |
| Crystal-center rock | 19 |
| Crystal-bearing nodule of stone | 31 |
| Crystal Cave is one | 19 |
| All-natural sparkler | 20 |
| A nodule of stone | 17 |
| Crystal-lined stones | 20 |
| Hollow rocks | 12 |
| Crystal-lined rocks | 19 |
| Thunderegg cousins | 18 |
| Crystalline stones | 18 |
| Stone nodules | 13 |
| Some sparklers | 14 |
| Some fancy paperweights | 23 |
| Showcases of rock bands? | 24 |
| Petrified Forest souvenirs | 26 |
| Items in some science museum gift shops | 39 |
| Hollow stones | 13 |
| Crystal-lined cavities | 22 |
| Rock expert? | 12 |
| An earth sci. | 13 |
| Trivial Pursuit category: Abbr. | 31 |
| Rand McNally subj. | 18 |
| Subj. with maps | 15 |
| Worldly wisdom? (abbr.) | 23 |
| World atlas subj. | 17 |
| Soc. studies once | 18 |
| Science involving elev. | 23 |
| Popular Sporcle subj. | 21 |
| Michael Jordan's major at UNC: Abbr. | 40 |
| Mercator's field: Abbr. | 27 |
| High school subject, briefly | 28 |
| Elem. sch. class | 16 |
| Atlas subj. | 11 |
| Atlas maker's subj. | 23 |
| Rock sci. | 9 |
| Natural sci. | 12 |
| Earth science subj. | 19 |
| Texas A&M subj. | 19 |
| Subj. for spelunkers | 20 |
| Subj. for rock stars? | 21 |
| Seismologist's field: Abbr. | 31 |
| Science: Abbr. | 14 |
| Science course listing abbr. | 28 |
| Sci. with cliff notes? | 22 |
| Sci. area | 9 |
| Rocky subj. | 11 |
| Rock-history subj. | 18 |
| Rock scientist's subj. | 26 |
| Rock science, in coll. schedules | 32 |
| Rock field: Abbr. | 17 |