| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| how is opal formed in nature | 1.22 | 0.1 | 1202 | 90 |
| how is opal made | 0.66 | 0.1 | 1241 | 88 |
| how is opal a mineral | 1.07 | 0.9 | 153 | 52 |
| how is opal mined | 1.75 | 0.1 | 9428 | 34 |
| what makes an opal an opal | 1.01 | 0.7 | 2943 | 34 |
| how were opals formed | 0.62 | 0.7 | 7633 | 48 |
| where does opal form | 1.59 | 0.3 | 1604 | 27 |
| is opal naturally occurring | 1.9 | 0.4 | 2721 | 50 |
| what is a created opal | 1.12 | 0.7 | 1645 | 83 |
| where does opal come from | 1.06 | 0.5 | 4206 | 33 |
