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Excerpt from The Colorado Plateau Region: Considered as a Field for Geological Study
In order to analyse sub-aerial erosion, we must consider it (a) as consisting of parts, and (b) as modified by condi tions.
A. All indurated rocks and most earths are bound together by a force of cohesion, which must be overcome before they can be divided and removed. The natural processes by which the division and removal are accomplished make up erosion. They are called disintegration and transportation.
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