| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| what sphere does ozone belong | 1.58 | 0.2 | 5466 | 29 |
| to what sphere does ozone layer belong | 1.58 | 0.3 | 1374 | 8 |
| what sphere contains the ozone layer | 1.4 | 0.9 | 2745 | 45 |
| what sphere is the ozone layer found | 0.63 | 0.6 | 3197 | 28 |
| ozone gas found in which sphere | 0.38 | 0.3 | 305 | 10 |
| ozone layer is in which sphere | 0.69 | 1 | 3233 | 26 |
| ozone layer is present in which sphere | 1.16 | 0.6 | 6923 | 59 |
| which atmospheric sphere has the ozone layer | 0.36 | 0.1 | 7957 | 20 |
| ozone layer is found in which sphere | 1.01 | 1 | 2435 | 63 |
| ozone layer lies in which sphere | 0.77 | 1 | 5636 | 89 |
| is ozone in the stratosphere | 0.52 | 0.9 | 5850 | 62 |
| is the ozone located in the stratosphere | 1.57 | 0.4 | 1521 | 89 |
