0 the study of how the surface of the earth is formed, how the separate pieces of it move, and the effects of this movement --
1 the theory that the earth's surface is made of large layers of rock that are always moving, causing earthquakes and volcanoes, and explaining the creation of the varied features of the earth's surface --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Vi kan slutföra det steg för steg hur lång vägen än är och den kan inte slutföras hur kort vägen än är om du inte ens markerar ditt fotavtryck.