Across
- 2. fractions that catch fire easily are .........
- 4. the darkest, most viscous, gloopiest fraction
- 5. means will turn to a gas easily
- 8. the process of splitting a large molecule into two smaller ones
- 9. hydrocarbons with short molecules have ... boiling points
Down
- 1. the fraction used to make plastics
- 2. means there is only so much of it and will run out
- 3. the oil that does not light well and reduces friction
- 6. hydrocarbons with high boiling points are .... molecules
- 7. a good fuel because it flows well