10metr 1 thousand kilometers 1 million meters 一千公里 This region,viewed from a low orbit,holds the whole of Lake Michigan;the broad sheet of water,like the flat silted lands around it,was formed by continental glaciers in the most recent gcological past,a few tens of thousands of years ago.The day's weather is marked by clouds arrayed in streets and clumps.Though we are looking at the homes of tens of millions of pcople,the work of human hands is hardly to be seen moP.com一 千 公 里