In the reading passage there is ample support for the author's claim that there are feasible theories caused to explain the cause of the ice age. However, the professor in the lecture gives several reasons arguments as a rebuttal to the author's point.
First, the professor contends that less sunspots does not bring less solar radiation. In recent studies, researchers observed decrease of the sunspots, while the total amount of solar radiation that comes to the earth had no change. Thus there are no relation between the solar radiaiton radiation and the sunspots. This casts doubt on the reading passage's claim that the decrease of sunspots brought the deplete of solar radiation to the earth.
Next, the professor insists that a huge explosion of volcano is was not the reason for the ice age. It is true that volcanic eruption affect the decrease of the planet's temperature, nevertheless it happens in short-term not in long period but the effect is generally short-term and not long enough to bring an ice age. However the ice age lasted for 500 years, so that a volcanic eruption cannot (띄어 쓰면 안 됨) explain the reason for this cooling period. This counters the reading passage's assertion that thick layers consists of ashen dusts which came from huge volcanic eruption, disturbed disturbing the solar radiation entering the earth, and then resulting in decrease of solar radiation.
Finally, the professor argues that the higher reflectivity of the planet is not the only reason for the event. Clouds are the one of the reflectivity substance the main factor of a planet’s reflectivity. But However, during the cooler period the evaporation of water to the atmosphere, resulting in formation of which forms clouds, will decrease, therefore leading to deplete of the clouds. Deplete of the clouds means less reflectivity, since and because less reflectivity cannot (띄어 쓰면 안 됨) explain the ice age, it cannot (띄어 쓰면 안 됨) gives precise reason for the cooling period. This refuetes refutes the reading passage's suggestion that the increase of the earth's reflectivity, which occurred due to the large massive growth of the glacier and snow cover on the planet, reflected and returned solar radiation back to the univers outer space, thus resulting in the ice age.
Writing 0-30 scale
Fair (21-23)
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