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47Scientists studying historical weather patterns have discovered that in the mid-sixth century, Earth suddenly became significantly cooler. Although few historical records survive from that time, some accounts found both in Asia and Europe mention a dimming of the sun and extremely cold temperatures. Either a huge volcanic eruption or a large meteorite colliding with Earth could have created a large dust cloud throughout Earth's atmosphere that would have been capable of blocking enough sunlight to lower global temperatures significantly. A large meteorite collision, however, would probably create a sudden bright flash of light, and no extant historical records of the time mention such a flash. Some surviving Asian historical records of the time, however, mention a loud boom that would be consistent with a volcanic eruption. Therefore, the cooling was probably caused by a volcanic eruption.
提纲:
理由不足,缺乏前提
事实根据不足,论断仓促
逻辑错误
The arguer tries to explain the main cause that made the cooling period of the earth in the mid-sixth century. A huge volcanic eruption and a large meteorite colliding with Earth are considered as the possible causes that blocked enough sunlight to lower the temperatures. For the existence of certain Asian historical records of the time, while no relevant proof could support the meteorite colliding, the arguer concludes that the cooling was caused by a volcanic eruption.
The logic of the inference in the argument is well-presented but it is not well-reasoned for some extinguished fallacies.
On the one hand, the arguer makes a mistake in list the possibilities that can cause the cooling in the sixth century. The arguer neither gives us two explanations without any necessary reasons, what's more, nor does he mention what makes the other potential possibilities groundless. Thus, his rough limit of the causes is totally unconvincing because the scale for the choices should be more extensive according to the factual situation, which the arguer also notes, "few historical records survive from that time".
On the other hand, the negation of the meteorite collision cause is based on a illogic judgment. The only reason that pumps the arguer to get rid of the possibility to choose meteorite collision is due to "no extant historical records of the time mention such a flash." Although the flash is regarded as a reasonable phenomenon of the collision, the lack of such flash can not prove that a large meteorite never happened at that time. Furthermore, the fact that no extant historical records remains is quite sensible because of the saying "few historical records survives" and it is not absolutely far from drawing the conclusion that meteorite collision had nothing to do with the cooling period.
Finally, the given reason in supporting the volcanic eruption school is not substantial at all to make the final conclusion either. First, the arguer fails to present more details and specific contents of the "surviving Asian historical records" on their discovery and function that could lead to the point about "a loud boom". Similarly, the arguer does not tell us why "a loud boom would be consistent with a volcanic eruption". Second, assumably, the loud boom really existed and could cause the volcanic eruption, however, this reason has no necessary relationship with the statement that the cooling was probably caused by a volcanic eruption. Thus, the arguer just gives us the possible causes that made the volcanic eruption but he still neglected the significant link that could put the causal relationship between the cooling and the volcanic eruption together.
In general, incomplete explanations, the lack of insufficient evidence as well as the weak logic inference of the final conclusion has made this argument not articulate. The arguer may have to collect more information and clarify the information with scientific methods before he makes the conclusion.
[ 本帖最后由 yogurt4 于 2006-1-14 17:18 编辑 ] |
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