| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| is pencil lead a mixture or pure substance | 1.57 | 0.1 | 7959 | 98 |
| is pencil lead a mixture | 1.77 | 1 | 9515 | 82 |
| is pencil lead a element or compound | 0.42 | 0.9 | 7492 | 12 |
| is pencil lead a compound | 1.52 | 0.7 | 8468 | 47 |
| is pencil lead a mineral | 0.45 | 0.5 | 6990 | 86 |
| is pencil made of lead | 1.58 | 0.3 | 1394 | 38 |
| is pencil lead a element | 0.3 | 0.8 | 3957 | 6 |
| what is in a pencil lead | 1.22 | 0.1 | 1630 | 1 |
| is pencil lead the same as lead | 0.27 | 0.8 | 6660 | 31 |
| a lead pencil consists of | 0.39 | 0.2 | 871 | 46 |
| what is the composition of pencil lead | 0.15 | 0.1 | 9675 | 3 |
| are lead pencils made of lead | 0.39 | 0.6 | 8692 | 19 |
