| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| a naturally occurring substance | 0.38 | 0.6 | 3481 | 76 | 31 |
| a | 1.89 | 0.1 | 2421 | 61 | 1 |
| naturally | 1.83 | 0.7 | 2554 | 11 | 9 |
| occurring | 1.23 | 0.7 | 4644 | 69 | 9 |
| substance | 1.36 | 0.8 | 1149 | 30 | 9 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| a naturally occurring substance | 1.02 | 0.2 | 4803 | 90 |
| hardest naturally occurring substance | 1.2 | 0.9 | 3782 | 94 |
| naturally occurring inorganic substance | 0.43 | 0.2 | 6953 | 62 |
| is ozone a naturally occurring substance | 0.09 | 0.9 | 4212 | 79 |
| hardest known naturally occurring substance | 0.19 | 0.3 | 9218 | 8 |
| is arsenic a naturally occurring substance | 0.91 | 0.7 | 7547 | 95 |
| tsca naturally occurring substances | 1.88 | 0.4 | 8630 | 98 |
| patent naturally occurring substance | 1.18 | 0.5 | 4241 | 33 |
| naturally occurring substances | 0.22 | 0.4 | 53 | 74 |
| hardest natural substance in the world | 0.76 | 0.5 | 1277 | 9 |
| which is the hardest substance | 0.1 | 0.6 | 720 | 14 |
| what's the hardest substance | 0.19 | 0.5 | 6027 | 93 |
| hardest natural substance on earth | 0.84 | 0.5 | 6395 | 100 |
| hardest substance in the world | 1.47 | 1 | 559 | 83 |
| what's the hardest natural substance on earth | 0.94 | 0.5 | 6656 | 85 |
| the hardest substance on earth | 1.78 | 0.8 | 9396 | 98 |
