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'.
Arrangement of clouds over certain areas
Answer: When asteroids enter the atmosphere of Earth or any other planet, they are called meteorites. Typically, asteroids are too small to form a circular shape, unlike dwarf planets or comets.
Explanation:
Why are meteoroids not considered dwarf planets?
<em>Key difference: A dwarf planet is “a celestial body in direct orbit of the Sun that is massive enough for its shape to be controlled by gravitation, but that unlike a planet has not cleared its orbital region of other objects.” An asteroid, on the other hand, is a large chunk of rock that orbits around the sun.</em>
Answer:
3) Bismarck, North Dakota
Explanation:
The city that has a climate characterized by confidentiality is Bismarck, North Dakota. This city is relatively close to the center of the US, thus it is far away from the large bodies of water. It is in the mid-latitudes, so it doesn't have too much of an influence from the Arctic or from the tropics. Bismarck has just about enough rainfall so that it is not semi-arid, though it is on the borderline. The summers tend to be dry and hot, while the winters tend to be very cold and snowy.
