| GEOMAGNETISM | Branch of geology |
| PETROLOGY | Branch of geology concerned with the study of the composition, origin and structure of rocks (9) |
| SEISMOLOGY | Branch of geology concerned with the study of earthquakes (10) |
| MINERALOGY | Branch of geology (10) |
| GEOMAGNETIC | Branch of geology dealing with the earth's field |
| TECTONICS | Branch of geology analyses section surrounding court (9) |
| CHARLESLYELL | In 1830-33, this geologist publishes Principles of Geology, followed in 1838 by Elements of Geology, in which he demonstrates that the processes that changed the earth in the past are continuing. What |
| LYELL | Charles ___, Scottish lawyer; author of 1880s three-volume work Principles of Geology (5) |
| GREENSTONE | Head of Geology enters awkwardly with one variety of jade (10) |
| MARINE | Kind of geology |
| AEON | Division of geology |
| SCHOOLOFROCK | Feature of geology college? (6,2,4) |
| ADAMSEDGWICK | 19th-century professor of geology at Cambridge, who established the Cambrian period from research in Wales |
| ESKER | In geology, a winding ridge of stratified sediment formed from the deposits of the meltwater of a retreating glacier (5) |
| AQUIFER | In geology, a type of underground store of fresh, usable groundwater (7) |
| IGNEOUS | In geology, one of the three principal classes of rocks with metamorphic and sedimentary (7) |
| SILL | In geology, a tabular sheet intrusion of igneous rock between older layers of sedimentary rock (4) |
| ROCK | In geology, the naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is composed. (4) |
| ARETE | In geology, a narrow sharp-crested ridge of rock separating Alpine valleys (cirques) formed by the action of glaciers (5) |
| EON | Largest division of time, in geology |
