Agument47 *自由女神小组*第十七次作业 觉得有很大的问题，哪位帮忙看看

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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.
Outline: From the article, the speaker asserts that the cooling of the earth was probably caused by a volcanic eruption rather than a large meteorite colliding with earth. But from the speaker’s reasoning, both the possibility of causes cannot be confirmed and disregarded.
1.        一些事件在亚洲和欧洲地区被发现，但是这些事件来源是否属实，准确。尽管两个地方有同样的记录，可能属实，但也许是一个地方的记录被某些原因带到了另一洲。其次，太阳的暗淡和异常的寒冷是否发生在同一时间，要是先寒冷，再太阳暗淡，怎么证明是太阳光被挡住无法给地球热量造成。
2.        即使属实，并且发生的时间也符合太阳光先被挡住使得地面温度下降，但也不能证明是它？某种奇怪的植物？要知道一切皆有可能。
3.        即使是太阳光被挡住导致天气寒冷也不能说明太阳光被遮是由火山爆发或岩石的碰撞所致。别的原因？宇宙自身的原因，某个物质挡住了太阳的部分光，太阳自身。
4.        假使是由这两种原因，也不能排除碰撞问题。首先，没有记载说明有一道亮光出现，也许是有些看到亮光的人没有记载这件事或者是记载的丢失。
5.        认为是火山爆发，是因为有记载说明有象火山爆发的声音出现。象不等于就是，or听错了。

From the article, the speaker asserts that the cooling of the earth in the mid-sixth century was probably caused by a volcanic eruption rather than a meteorite collision with earth. However, from the speaker's reasoning, i think that both the possibility of causes should not be confirmed and disregarded.

First, the speaker says that few historical records survive from that time, just some related accounts in Asia and Europe. Therefore, it is very specious about the truth of the records. To start with, we do not confirm whether these accounts were recorded objectively by people. Although both the Asia and Europe have these records which seems it is reasonable that these records are believable.  But maybe only Europe recorded these and brought them to Asia for researching or only Asia recorded and brought them to Europe. Secondly, if these records were the facts, whether a dimming of the sun and extremely cold temperatures happened the reasonable time. Perhaps before the sun dimmed, the temperatures had already turned. In this situation, the dimming of the sun may not the cause of temperatures decreasing.

Secondly, assume that the dimming of the sun happened before the temperatures turned to cold, perhaps other factors induced the changing of global temperature. Maybe some special materials from other stars decreased the temperature drastically during that period. Or the geometrical changing contributed to the changing of temperature or the level of ocean varied.

Thirdly, provided that only the sunlight was blocked so that the temperature deceased significantly. What made the sunlight be blocked? Perhaps it was certain object in universe that clouded the sunlight. Or it was the character of sun during that time could not emit enough lights. Therefore, both a huge volcanic eruption and a large meteorite colliding with Earth which could have created a large dust cloud throughout Earth's atmosphere to block the sunlight are just two possible factors.

Finally, suppose that we can exclude other factors which may cloud the sunlight, it is dubious that it was a volcanic eruption caused the cooling rather than a large meteorite collision. The speaker claims that a large meteorite collision would probably create a sudden bright flash of light but no records mention such a flash at that time. Perhaps this flash did not attract the recorders’ attention or recorders did not take into consider that they must record this phenomenon, or some records about bright flash were lost. Meanwhile, the speaker mentions that some surviving Asian historical records of that time mention a loud boom that sounds like a volcanic eruption, but no surviving records proved that there was a volcanic eruption, that is to say, this sound may be a curious phenomenon which people could not figure out rather than a volcanic eruption induced.

To sum up, both the volcanic eruption and a large meteorite collision possibly caused the cooling of temperature at that time, Meanwhile, neither of them possibly caused this phenomenon. The speaker’s assertion need suffice evidence and thorough reasoning.  


[ 本帖最后由 wonderfullname 于 2007-2-11 14:27 编辑 ]