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.
种土料堆筑而成,它们
抵御洪水突袭时,常有
孔险情发生而使人措手不及。
积岩层的
围和厚度
在其他
