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发表于 2006-12-31 14:58:26
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argument47 Scientists 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.
In this analysis, the arguer concludes that a volcanic eruption caused the earth suddenly cooling in the mid-sixty century. To justify this conclusion the arguer points out that ether a volcanic eruption or a large meteorite collision may cause the cooling as the accounts in Asia and Europe mentioned. The arguer’s conclusion is also based on the assumption that there was no meteorite collision since no historical records mentioned its sudden flash, and some Asian records shows a loud boom that may be caused by a volcanic eruption. However, the evidence presented throughout the argument, however, is vague and hence does not lend strong support to what the arguer claims.
First of all, the major problem with this argument is the unwarranted assumption that there are only two factors can cause the Earth’s sudden cooling, which include the volcanic eruption and the meteorite collision. It is entirely possible that some other incidents can also attribute to create the large dust cloud throughout Earth’s atmosphere than to block sunlight. It is also possible that some other factors contribute to the cooling throughout other ways, which are also create dimming of the sun and cold temperature as the accounts of Asia mentioned. Without considering and eliminating these and other possible alternative explanations for the cooling, the arguer cannot conclude one is the causer based on the other one is not.
In addition, the arguer falls to lend strong support to the assumption that there was no meteorite collision with the mere evidence that no records of that time mentioned the flash a collision may create. Was the flash perceptible and unusual enough to be put into record? Perhaps, people did not notice this flash or they did not take it seriously to make any record. Moreover, the arguer mentioned that e few records survive from that time, hence there is large probability that the records mentioned that flash were destroyed or lost. In short, the arguer provides litter crucial evidence indicates that no meteorite collision was happened at that time.
Finally, even if only meteorite collision and volcanic eruption can cause Earth’s sudden cooling, and even if no collision happened at that moment, I remain unconvinced to the conclusion that the cooling was caused by the volcanic eruption, substantiated by nothing but a boom mentioned in some Asia’s records. Despite whether the boom is created by a volcanic eruption or not, the arguer provides no information about the eruption’s size, its possible location, its duration, or the dust it created. Lacking enough evidence, it is unwarranted to draw any conclusion relies on a simple boom.
To sum up, the evidence offered in support of the recommendation provides little credible support for it. To better evaluate the argument, I would need more evidences that only meteorite collision and volcanic eruption are able to cause a dimming sun and Earth’s sudden cooling, and reliable evidence that no meteorite collision happened that time. Before I can accept the conclusion, the arguer must present more information concerning the volcanic eruption and the its capacity to cause the sudden Earth’s cooling. |
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