| certain geological areas | 0.31 |
| the earth | 0.31 |
| enter the crude oil hea… | 0.67 |
| save whale | 0.46 |
| produce propane | 0.45 |
| produce diesel | 0.45 |
| range by weight | 0.44 |
| produce gasoline | 0.43 |
| meet coal | 0.41 |
| be a mixture of hydroca… | 0.40 |
| go through filtering cl… | 0.37 |
| come out under the filt… | 0.37 |
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| birth defects | 0.16 |
| asphalt | 0.38 |
| water | 0.37 |
| impurity | 0.37 |
| paraffin | 0.36 |
| much carbon | 0.35 |
| different characteristi… | 0.33 |
| low acid value | 0.33 |
| lustre | 0.33 |
| less impurity | 0.33 |
| mixed base | 0.31 |
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| output | 0.67 |
| raw material | 0.46 |
| a fossil fuel | 0.44 |
| the most important comm… | 0.40 |
| liquid | 0.37 |
| occurring, unrefined pe… | 0.36 |
| finite resource | 0.36 |
| oil | 0.36 |
| commodity | 0.36 |
| china | 0.34 |
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| extracted | 0.71 |
| heated to required temp… | 0.68 |
| refined into kerosene | 0.61 |
| refined into diesel fuel | 0.60 |
| produced in the united … | 0.56 |
| refined into gasoline | 0.54 |
| composed of hydrocarbon… | 0.54 |
| processed | 0.51 |
| exported | 0.51 |
| refined into heating oil | 0.50 |
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| primary | 0.54 |
| primary materials produ… | 0.40 |