Immense valleys more than 800 feet deep (enough to swallow the Woolworth Building in New York City) encircle the entire Antarctic continent: the scars from giant floods.

• 许多超过250公尺深的巨大峡谷（足以吞没纽约市的伍尔沃夫大楼）环绕著整个南极大陆，它们都是巨大洪水造成的伤疤。