The processes that are both artificial denudation and artificial accumulation to original geomorphy were uninterrupted, and original geomorphy was eroded by floodwater.
As Lyell has well remarked, the extent and thickness of our sedimentary formations are the result and the measure of the denudation which the earth's crust has elsewhere undergone.
工程仍是各种土料堆
,它们
抵御
袭时,常有渗漏穿孔险情发生
所说
那样， 我们沉积岩层
围和厚度是地壳在其他地方
