▶ Your Answer :
Both the reading passage and the lecture deal with cause of the
Little ice age. In the reading, there is ample support for the author's claim. However, the professor gives several reasons as a
rebuttal against the writer's point.
To begin with, the lecturer argue that decreasing the amount of
solar radiation and sunspot is lack of evidence. This is because, according to
recently study, scientist could not find record that diminished the amount of solar
radiation and sunspot during that time. Moreover, this is not involved in
energy of solar radiation. Even if sunspot was not observable, the Sun emitted its
energy regularly to the Earth. This casts doubt on the author's claim that the
Little ice age was triggered by decreased solar radiation.
On top of that, the speaker contends that mass volcanic eruption is
less likely to affect the Little ice age because The little ice age had lasted
more than 500 years. Although volcanic ash could affect in a short period of
time, it is not able to cover atmosphere as much as long period of time. This
means a mass volcaic eruption theory did not take considered the Little ice age's period of time. This refutes the writing
passage's that a massive volcanic eruption brought about the Little ice age.
Lastly, the speaker maintains that the snow did not provoke increasing the
Earth's reflectivity. This is because, snow is not only cause of its reflectivity
but also cloud could affect. However, when the Little ice age, ocean
temperature had been cooling down, leading to decreasing evaporation and the
amount of cloud. This means that cloud must need vapor, but there was lack of it.
Therefore, snow and cloud would not affect the Earth’s reflective. This
counters the reading passage's suggestion that global cooling may have
generated owing to an increase in the Earth's reflectivity.
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