They found fossils of microscopic marineplants which suggest that the region was once open ocean, not solid ice.
他们发现了微型海洋植物的化石，表明该地区曾经是开放的海洋，而不是坚固的冰层。
2
The reason for this increased cloud cover, it turns out, is the exceptionally large amount of microscopic marineplants.
事实证明，云量增加是大量的微型海洋植物导致的。
3
Within samples collected from the solid substances lying beneath the ice they found fossils of microscopic marineplants which suggest that the region was once open ocean not solid ice.