▶ Your Answer : The reading passage contends that the orgin of forts bulit with vitrified stones in Scotland has been explained. On the other hand, the lecturer brings up several points that contradict this argument.
First of all, the lecturer questions the validity of the point in the reading passage that signal fires caused vitrification. This is attributed to the fact that sinal fires were taken place in only one or two places. However, studies show that the entire wall is vitrified. Thus, the reading passage's first point is contradicted.
Moreover, the lecturer casts doubt on the point made by the reading passage that lighting is the culprit of the stones' vitrification. This is because lighting is an intensive pheonomenon that happens in a point basis. He points out that the structiure is quite large so lighting was not able to make cracks in entire forts. Consequently, the reading passage's second point is invalid.
Last but not least, the lectuerer disagrees with point made in the reading passage that volcanic rocks were used to build the forts. It is obvious that there was no evidence of volcanic eruptions in that area on that time. In reality, the forts were made from local materials because they were not able to move heavy materials. As a result, with such reasoning, the reading passage's final point is refuted. |