paraphrasing
171쪽 1번 문제
During the cooler period, precipitation continues fall, forming aggregates of oddly shaped, interlocking crystals ranging in size from several millimeters to a centimeter, which come together to generated increasingly thicker layers of ice.1번 문제에
a) due to the falling temperatures, the unusual shape of the crystals results in thicker ice.
b) ice layers are formed as a result of the snow that falls in cold weather and clumps in groups.
에서 왜 정답이 b인 걸까요. 저는 a나 b나 차이가 없어 보이는데 어떤 부분이 틀린 것인지 잘 모르겠어요.