I think it's A but here's an explanation anyway: as you heat the crude oil, the different hydrocarbons, having different boiling points, boil and evaporate up the column. Those with lower boiling points, shorter in chain length, will condense nearer the top of the fractional distillation column. Those that are more viscous, larger in chain size, will have high boiling points, so will evaporate last and condense lower down in the column. Therefore, you achieve all the different oils / materials (oil, petrol, gasoline, tar etc etc). I hope this helps. If not, then a good website to use is 'BBC bitesize, fractional distillation'.
Explanation:
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I would say D. Fossil fuels must be burned to release their energy.
Answer: I think it is true because there are fossils found in all different layers.
Explanation:
Answer:
Reasons wht few people in some LEDC (Less Economically Developed Country) are:
- <em>traveling by car also involves costs regarding maintenance, upkeep, repairs and fuel consumption.</em>
- <em>the costs of buying a car are high in countries that are not economically developed.</em>