...What had so smoothed them I do not know, for they seemed to be ill-placed for water erosion... 
Stewart Edward White 「African Camp Fires」
...However, the dip ofthe rocks has channelled drainage southward and erosion has cutnumerous, deep, parallel-sided canyons rather than a simple, retreatingescarpment...
Sydney Anderson 「Mammals of Mesa Verde National Park, Colorado」
...Less spectacular, but nevertheless important, problems confrontingconservationists include streambank erosion, channel deterioration,silting, recreational demands for water, and irrigation needs...
Artie L. Metcalf 「Fishes of Chautauqua, Cowley and Elk Counties, Kansas」
...Plate shows in a measure the extent of this erosion...
Cosmos Mindeleff 「The Repair Of Casa Grande Ruin, Arizona, in 1891」
... Water erosion has certainly formed the Theban wadis...
L.W. King and H.R. Hall 「History Of Egypt, Chaldæa, Syria, Babylonia, And Assyria In The Light Of Recent Discovery」
...In either case, erosion has carried away its walls and filled upthe channel leading from it, and thus obliterated its site...
Gerard Fowke 「Archeological Investigations」
...A short distance from these sites, across a ravine, is a bare, narrowridge, very steep on each side, so that erosion would readily act...
Gerard Fowke 「Archeological Investigations」
...The hills and valleys were asthey now exist; the erosion has been very slight as compared with whathas taken place since the loess was brought above the water, to whichit owes its origin...
Gerard Fowke 「Archeological Investigations」
...In some mounds only a small portion near the marginhas been removed; in others the erosion has progressed to such anextent that observations were possible at varying distances, to andbeyond the center...
Gerard Fowke 「Archeological Investigations」
...Montezuma Well () is an irregular, circular depression,closely resembling a volcanic crater, but evidently, as Dr Hoffman wellpoints out, due to erosion rather than to volcanic agencies...
Jesse Walter Fewkes 「Archeological Expedition to Arizona in 1895」
...The great natural archway which covers thewhole pueblo protects it from wind and rain, and as a consequence,save on the front face, there are few signs of natural erosion...
Jesse Walter Fewkes 「Archeological Expedition to Arizona in 1895」
...This is a neat, finely-decussated, concolorous species, with the upperwhorls nodulous from erosion, as in Vivipara praerosa, Gerst...
John McDouall Stuart 「Explorations in Australia, The Journals of John McDouall Stuart」
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