| archean geology(expression, geology, history, earth) |
| cenozoic event(expression, geology, event, history) |
| eological era(expression, geology, history, era) |
| event in geological history of earth(expression, geology, event, history) |
| extinction event(expression, geology, event, extinction) |
| geologic time(expression, geology, time, earth) |
| geological age(expression, geology, history, age) |
| geological eon(expression, geology, history, eon) |
| geological epoch(expression, geology, history, epoch) |
| geological period(expression, geology, period, history) |
| geology timeline(expression, geology, history, timeline) |
| impact crater on earth(expression, geology, earth, crater) |
| mesozoic event(expression, geology, event, history) |
| paleozoic event(expression, geology, event, history) |
| phanerozoic geology(expression, geology, history, earth) |
| plate tectonic(expression, geology, history, plate) |
| proterozoic geology(expression, geology, history, earth) |
| supercontinent(noun, geology, history, continent) |
| volcanism(noun, geology, history, volcanology) |