| 100% | GEOLOGY | 7 | Study of rocks that helps us determine history |
| 42% | GEOLOGY | 7 | Study of physical history of rocks and minerals |
| 38% | DAR | 3 | Org. that studies U.S. history |
| 37% | GSA | 3 | US agency that helps functioning of federal agencies (abbr) |
| 37% | GEOLOGY | 7 | Study of rocks |
| 37% | GENEALOGY | 9 | Study of rocks |
| 37% | ERA | 3 | The Postwar ___ (span of US history that began in 1945) |
| 36% | GEOL | 4 | Study of rocks: Abbr. |
| 35% | PETROLOGY | 9 | The study of rocks |
| 35% | AER | 3 | Nonprofit financial assistance org. HQed in Arlington that helps US Army soldiers and dependents in the form of grants or loans (abbr.) |
| 35% | EYE | 3 | Organ that helps us see |
| 35% | PETROLOGY | 9 | The scientific study of rocks |
| 35% | GEOLOGIC | 8 | Relating to studies of rocks |
| 34% | GEOLOGY | 7 | Study of earth history |
| 34% | GENEALOGY | 9 | Study of family history |
| 34% | ORE | 3 | Type of rock that contains sufficient minerals |
| 33% | LITHOLOGY | 9 | Scientific name for the macroscopic study of rocks |
| 33% | ETYMOLOGY | 9 | Study of the history of words |
| 33% | PHILATELY | 9 | Study of stamps and postal history |
| 32% | ETYMOLOGY | 9 | Study of origins and history of words |
| 32% | ORE | 3 | Rock that's of interest to miners |
| 32% | ORE | 3 | Rock that's a source of metal |
| 32% | ORE | 3 | Rock that's dug out of mines |
| 32% | SHALE | 5 | Rock that's a source of petroleum |
| 32% | AEC | 3 | US agcy. that established its Technical Analysis Branch in 1961 to study long-term biological and ecological effects of nuclear war |
| 32% | NATURAL | 7 | Type of history that's study of plants and animals |
| 32% | NAPPES | 6 | Sheet-like bodies of rock that have moved, in geology |
| 32% | ZERO | 4 | Number of incorrect entries I hope we'll receive for this crossword contest (this clue should help with that) |
| 32% | ASTROLOGY | 9 | Study of celestial objects, their influence on us |
| 31% | ROBOTICS | 8 | Study of machines that look alive or do jobs |