(n) the outermost level of the land or sea, Syn. Earth's surface, Example:earthquakes originate far below the surface; three quarters of the Earth's surface is covered by water
[天经地义 / 天經地義, tiān jīng dì yìㄊㄧㄢ ㄐㄧㄥ ㄉㄧˋ ㄧˋ] lit. heaven's law and earth's principle (成语 saw); fig. right and proper; right and unalterable; a matter of course#28703