▶ Your Answer :
The lecturer argues that the causes of
vitrification are not confirmed. This
contradicts the reading passage’s claim that there are plausible theories to
the forts which is scattered throughout Scotland and built with stones are
vitrified.
First, the lecturer claims that it is not
likely signal fires cause the vitrification. This fires that make people
communicate each other is possible for a few areas, but it is impossible for
whole area. Therefore, it would not change at all by these signal fires. This
casts doubt on the reading passage’s claim that it is quite a possible that
vitrification was caused by signal fires because vitrified stones are most
common on the upper parts of the walls which is the logical location of signal
fires.
Second, the lecturer points out that there is
no evidence lightening makes stones vitrified. Lightening at the same place
over and over is impossible. Since the area was large, it doesn’t make sense.
It is more likely these cracks on rocks are because these were old and poor
conditions. This counters the reading passage’s claims that Lightning is
plausible explanation.
Finally, the lecturer contends that volcanic
rock does not correspond to vitrification. There was not volcano eruptions
nearby. Therefore, if this was correct, the people should have moved the heavy
rocks over distances. In addition, there was no transportations like buses,
cars. This refutes the reading passage’s claim that vitrification process
occurred prior to construction.
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