Any one who compares the terraces that are shaped by rivers and the sea with the terraces that are found in the Yorkshire Dales must see that in the one case the denuding agent has acted alike upon beds of all degrees of hardness, and has shorn off the edges of the rocks to one level, whether the strata were horizontal or inclined; in the other case the denuding agent has acted unequally upon the rocks according to their varying powers of resistance, so that the harder beds were left in relief; and, so far from being all shorn off to one level, it would perhaps be difficult to find any one of the Dale District terraces that is not more or less inclined. The bases of the cliffs formed by the one denuding agent are quite level: those left by the other are often inclined many degrees.