The route over the Arctic Ocean has always been a shortcut to connect Asia, Europe and North America. Moreover, due to global warming and the melting of the Arctic ice sheet, the navigation of the Arctic "Northwest Passage" is possible.
The Arctic Ocean route is the shortest route connecting the Atlantic Ocean and the Pacific Ocean as well as Russia, Europe and Asia.
There are two kinds of ice in the polar regions: sea ice and icebergs, which are formed in different environments. Sea ice freezes directly in the sea, so it is salt water after melting; On the contrary, an iceberg is a glacier near the sea, and the big ice in it falls into the sea, so it is fresh water after melting. Aurora often appears in the sky of the North and South poles, and the ionosphere in the atmosphere is the result of the solar wind blowing to the earth, which is very beautiful.
Animals in the North and South poles are also different: polar bears with fur in the North Pole; There are penguins in Antarctica.