This being the case, we are compelled to admit that the escarpments owe their origin in chief part to the rocks of which they are composed, having resisted subaerial denudation better than the surrounding surface; this surface consequently has been gradually lowered, with the lines of harder rock left projecting.
Hau horrela delarik, beharturik aurkitzen gara onartzera malkarrak honexegatik sortu zirela nagusiki, alegia, haien osagai diren harriek, erosio atmosferikoari inguruko azalerak baino hobeto eutsi ziotelako; azalerok, beraz, beheratuz joan ziren mailaz maila, haitz gogorragozko lerroak irten-irten geratu zirelarik.