What are the characteristics of the global land and sea distribution of world geographical operations?

First of all, the world's oceans are not only vast, but also interconnected. All oceans are connected by wide waters or narrow waterways. Even if it is a relatively closed inland sea or continental sea, there are straits connected with other seas or oceans. The land in the world is surrounded by the ocean and isolated from each other. Except for the narrow isthmus between Eurasia and Africa and between North and South America, all other continents are "islands" surrounded by the ocean, but people call the land smaller than Greenland an island and the land larger than Australia a continent.

Second, the ocean and land are unevenly distributed on the earth's surface. 67% of the global land area is concentrated in the northern hemisphere, while 57% of the global ocean area is concentrated in the southern hemisphere. The ocean area accounts for about 6i% of the total land and ocean area in the northern hemisphere and 8 1% in the southern hemisphere. The land between 60 and 70 degrees north latitude accounts for 765,438+0% of the total land and ocean area, while there is almost no land between 56 and 65 degrees south latitude, so some people call the northern hemisphere the land hemisphere and the southern hemisphere the water hemisphere. Of course, there is another way to divide the land hemisphere and the water hemisphere, that is, the hemisphere centered on Duman Island at the mouth of Villain River in France includes Eurasia, America and Africa, which is called the land hemisphere; The hemisphere centered on Antioch Hatahima in southeast New Zealand, where the ocean area accounts for 90.5% of the total land and ocean area, is called the water hemisphere.

Third, there is an irregular phenomenon of north-south symmetry in the distribution of land and sea. In terms of land distribution, there are Africa in southern Europe, Oceania in southern Asia and South America in southern North America. In terms of land and sea distribution, there is a smaller Indian Ocean in the south of the huge Eurasian continent, a smaller Oceania in the south of the huge Pacific Ocean, an Arctic Ocean in the North Pole and Antarctica in the South Pole.