| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| atmospheric oxygen levels over time | 1.75 | 0.1 | 7301 | 74 | 35 |
| atmospheric | 0.76 | 0.9 | 3808 | 79 | 11 |
| oxygen | 0.8 | 0.4 | 236 | 1 | 6 |
| levels | 0.26 | 0.2 | 4176 | 43 | 6 |
| over | 1.79 | 0.3 | 6497 | 96 | 4 |
| time | 1.69 | 0.5 | 5511 | 48 | 4 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| atmospheric oxygen levels over time | 1.02 | 0.7 | 2815 | 40 |
| oxygen levels over time | 0.56 | 0.4 | 3092 | 48 |
| oxygen levels on earth over time | 0.68 | 0.8 | 6496 | 56 |
| earth oxygen level over time | 0.55 | 0.1 | 4521 | 6 |
| oxygen levels on earth over time graph | 0.94 | 0.5 | 3196 | 19 |
| oxygen levels in the atmosphere | 1.91 | 0.2 | 7318 | 93 |
| rise in atmospheric oxygen | 0.94 | 0.2 | 343 | 55 |
| normal atmospheric oxygen levels | 1.68 | 0.5 | 7729 | 18 |
| oxygen approximate level in the atmosphere | 1.08 | 0.6 | 6577 | 44 |
| increased levels of oxygen in the atmosphere | 0.31 | 0.6 | 6236 | 15 |
| oxygen levels going up and down | 1.3 | 0.8 | 3632 | 20 |
| current oxygen levels in atmosphere | 1.94 | 0.2 | 7412 | 9 |
| percentage of oxygen in early atmosphere | 0.43 | 0.5 | 9168 | 70 |
| normal oxygen levels in atmosphere | 1.01 | 0.3 | 4683 | 97 |
| normal oxygen atmosphere level | 1.23 | 0.9 | 9258 | 73 |
| oxygen level in the air | 0.79 | 1 | 6993 | 72 |
