해커스 리딩 166페이지에 있는 Green Glaciers의 2문단에 있는 문장인데요
Early reports, quickly discarded due to lack of evidence, attributed the unusual green shade of some Amery icebergs to high levels of metallic compounds in the ice, leaving the causation of the color a matter of contention and sparking a series of exploratory studies.
#굵은 표시한 부분에서 causation of the color a matter of contention이 어떻게 설명되는지 모르겠어요 color 다음에 a matter of가 어떻게 온거죠?
#추가로 질문 하나더 할께요..Early reports, quickly (which were가 생략된거 맞나요??)discarded due to lack of evidence,