| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| how are opals formed in australia | 1.54 | 0.3 | 2008 | 12 |
| how are opals formed | 0.85 | 0.6 | 773 | 97 |
| why are opals only found in australia | 0.33 | 0.1 | 7953 | 12 |
| how are natural opals formed | 1.77 | 0.2 | 8381 | 32 |
| opal formation in australia | 0.16 | 0.1 | 2185 | 16 |
| opals in australia mining | 0.29 | 1 | 6502 | 9 |
| where are opals mined in australia | 0.74 | 0.7 | 5033 | 59 |
| how to find opals in australia | 1.49 | 0.6 | 8958 | 100 |
| opal formation in australia and new zealand | 1.4 | 0.8 | 1321 | 99 |
| how is opal formed in nature | 1.62 | 0.8 | 527 | 28 |
| how are opals made | 1.69 | 0.7 | 2135 | 11 |
| how do opals form | 1.35 | 0.3 | 7562 | 23 |
| opals and gems of australia | 0.9 | 0.5 | 1916 | 53 |
| how is opal created | 1.49 | 1 | 8265 | 4 |
| pictures of australian opals | 1.77 | 0.4 | 2168 | 57 |
| where do opals come from | 1.15 | 0.1 | 4205 | 14 |
