| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| Petrology deals with the study of these, including origin & classification | rocks | $400 | DJ | -OLOGIES | 2024-05-01 | #9093 | |
| Igneous, sedimentary & metamorphic are the 3 main types of these | rocks | $200 | DJ | SCIENCE | 1996-06-03 | #2721 | |
| Petrology is the study of these, some of which were once sold as pets | rocks | $200 | DJ | PHYSICAL SCIENCE | 1989-12-07 | #1214 |