| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | geologia | geologiaj |
| Accusative | geologian | geologiajn |
| Afrikaans | geologies |
|---|---|
| Dutch | geologisch |
| English | geological |
| French | géologique |
| German | geologisch |
| Italian | geologico |
| Spanish | geológico |
| Swedish | geologisk |
| Welsh | daearegol |