Both the lecture and the reading hold different positions, respectively, on the issue of “the K-T extinction was caused by volcanic activity is the almost simultaneous occurrence of the two accidents”. The lecture’s argument is formed around many points that which are in direct contrast to the material in the reading passage.
First, the reading passage points out that the occurance was probably the result of a gigant amount of volcanic activity. However, the lecturer refutes this by arguing that the distance between mass crater and volcanic area is too far, so it is not lucid that the event was solely caused by a mass crater in India.
Second, the reading passage mentions that a large amount of dust and ash blocked out the sun ,which triggered the mass extiction. On the other hand, the speaker in the lecture rebuts this by claiming that the argument is ridiculous because vocanic activity had a iridium placed in high elevation at that time. As a result, the chance that particles hindered the sun from lightening the earth is too low.
Finally, the reading passage says that the the leading step of Deccan volcanism ended near the K-T boundary. In contrast, the lecture counters the reading’s point by claiming that generally, it takes over millions of years to end when mass extinction occurs, though, the K-T extiction was progressed for only a few thousands of years. It is too short span to argue that the K-Textiction is general case of mass extinction.
In conclusion, the reading passage presents three aspects with regards to volcanic activity as a cause of K-T extinction However, the lecturer’s argument makes it clear that none of these characteristics justify the reading passages’s claim.
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