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Erosion   /ɪrˈoʊʒən/   Listen
Erosion

noun
1.
(geology) the mechanical process of wearing or grinding something down (as by particles washing over it).  Synonyms: eating away, eroding, wearing, wearing away.
2.
Condition in which the earth's surface is worn away by the action of water and wind.
3.
A gradual decline of something.
4.
Erosion by chemical action.  Synonyms: corroding, corrosion.



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"Erosion" Quotes from Famous Books



... Bable Tower, hed they but known ther secret, mighter from thet same material have bilt a dome higher nor St. Paul's, thet would uv shone like burnished silver 'nd would hev retained all its strength 'nd splendor, notwithstandin' ther erosion uv time 'nd ther abrashin' uv ther ages, even till now, tho' since then two hundred generations uv ...
— The Wedge of Gold • C. C. Goodwin

... also occur in the articular cartilages. They quickly lose their peculiar glistening polish, their semitransparency is lost, and the natural tint of a pearl-like blue gives way to a dirty yellow. Later this is followed by erosion of the cartilages at such points as they happen to be in greatest contact. The ends of the bones are thus exposed, and their medullary cavities exposed to infection. As a result we get in them the changes we have ...
— Diseases of the Horse's Foot • Harry Caulton Reeks

... occurs when water channels and reservoirs become clotted with silt and mud, a side effect of deforestation and soil erosion. ...
— The 2008 CIA World Factbook • United States. Central Intelligence Agency.

... through it, does also find as ample illustrations in the sweeping Rhine as in any of the humbler streams whose courses I had watched and studied at home. These two principles afford perhaps the strongest and most conclusive of all proofs, that the hills and valleys of our planet are all the result of erosion. ...
— The Youthful Wanderer - An Account of a Tour through England, France, Belgium, Holland, Germany • George H. Heffner

... The forms of erosion were as varied as the rock itself, each different-coloured rock stratum presenting a different surface. In one place the surface was broken into rounded forms like the backs of a herd of elephants. In ...
— Through the Grand Canyon from Wyoming to Mexico • E. L. Kolb

... truncated peak of Coropuna was formed by a last flickering of the ancient fires. Dr. Bowman says that the greater part of the vast accumulation of lavas and volcanic cinders in this vicinity goes far back to a period preceding the last glacial epoch. The enormous amount of erosion that has taken place in the adjacent canyons and the great numbers of strata, composed of lava flows, laid bare by the mighty streams of the glacial period all ...
— Inca Land - Explorations in the Highlands of Peru • Hiram Bingham

... application of a 10-6-5 fertilizer. Strips six to eight feet wide on each side of the contoured rows received frequent cultivation each growing season, while strips of orchard grass sod were left between the rows to prevent erosion. The soil is Riverdale (tentative series) sandy loam that had been in orchard grass sod for ten years before the experiment was begun. It has been necessary to spray the trees each year with DDT, parathion, or both to ...
— Northern Nut Growers Association Report of the Proceedings at the Forty-Second Annual Meeting • Northern Nut Growers Association

... go on for four or five months, till the Croutha have all their surplus captives sold off. That country," he added, gesturing at the screen, "will be flooded out when the rains come. See how it's suffered from flood-erosion. There won't be a thing there that can't be knocked down and transposed out ...
— Time Crime • H. Beam Piper

... surface gravels on a plateau; note then the level, and the relation of them to any cliffs; do they end abruptly at a cliff edge, showing that the valley was filled up; or do they fade away to the edge, showing that they are older than the valley erosion? Gravels may be the filling up of a valley which was previously eroded; note the highest level at which they can be traced; often little pockets of deposit, or traces of sandy strata, can be found clinging high up on cliffs; also note the ...
— How to Observe in Archaeology • Various

... a mound of earth or stone worn away by erosion," answered the Professor, with an assurance that forbade any one to question the ...
— The Pony Rider Boys in the Grand Canyon - The Mystery of Bright Angel Gulch • Frank Gee Patchin

... suburbs, so-called, cover a thousand hectares, an area a third less than that of Windsor Forest, the enterprising tourist will have some feeble notion of the waste before him. The place is indeed altogether indescribable—surely one of the most striking testimonies to the force of erosion existing on the earth's surface. The explanation of the phenomenon is found here. At a remote period of geological history the action of mighty torrents let loose sculptured these fantastic and grandiose monoliths, bored these ...
— The Roof of France • Matilda Betham-Edwards

... erosion and floods: Forests help to regulate the flow of streams and prevent floods. Most streams are bordered by vast tracts of forest growths. The rain that falls on these forest areas is absorbed and held by the forest soil, which is permeated with decayed leaves, decayed wood and root fibers. The ...
— Studies of Trees • Jacob Joshua Levison

... temperatures or from molten materials. They come from magmas—molten mixtures of minerals, often containing gases. They come from deep below the surface of the earth. If they cool off while below the surface, they form intrusive rocks, which may later be revealed by erosion. When magmas reach the surface red hot, they form extrusive rocks, such as volcanic rocks. Thus, granite is an igneous, intrusive rock; lava is an igneous, extrusive rock. (Notice how the type of rock tells its past history—if you know ...
— Let's collect rocks & shells • Shell Oil Company

... mountains, in the position of grottoes communicating with each other by passages. This almost perfect horizontality, this gentle and uniform slope, appears to be the result of a long abode of the waters, which enlarge by erosion clefts already existing, and carry off the softer parts the more easily, as clay or muriate of soda is found mixed with the gypsum and fetid limestone. These effects are the same, whether the caverns form one long and continued range, or several of these ranges lie one over another, ...
— Equinoctial Regions of America • Alexander von Humboldt

... contrary, may be furnished with a band or sheath of comparatively soft metal larger than the bore; the gas then acting on the base of the projectile, forces the band through the grooves, sealing the escape, entering the projectile, and, to a great extent, mitigating the erosion of surface. This is, of course, universally known. It is also pretty generally known among artillerists that the effect of the resistance offered by the band or sheathing on the powder is to cause more complete combustion of ...
— Scientific American Supplement, No. 324, March 18, 1882 • Various

... greater than that now obtaining upon Earth, was probably of the order of magnitude of three meters of mercury, originally. As to the erosion, they might have had more water to begin with than ...
— Skylark Three • Edward Elmer Smith

... lowlands. Some of the valleys are of considerable width; in other cases the opposite walls of the gorges are but two or three hundred yards apart, and fall almost vertically thousands of feet, representing an erosion of hard rock of many millions of cubic feet. One result of the action of the water has been the formation of numerous isolated flat-topped hills or small plateaus, known as ambas, with nearly perpendicular ...
— Project Gutenberg Encyclopedia

... have the desirable condition of tough hardness, making chrome steels extremely valuable for all purposes requiring great resistance to wear, and in higher-chrome contents resistance to corrosion. All chromium-alloy steels offer great resistance to corrosion and erosion. In view of this, it is surprising that chromium steels are not more largely used for structural steel work and for all purposes where the steel has to withstand the corroding action of air and liquids. Bridges, ...
— The Working of Steel - Annealing, Heat Treating and Hardening of Carbon and Alloy Steel • Fred H. Colvin

... forces in order to mould the face of a country. They tell us that the valley, with its deep sides and wide opening to the sky, may have been made by the slow operation of a tiny brooklet that trickles now down at its base, and by erosion of the atmosphere. So we shape ourselves—and that is a great thing—by the ...
— Expositions Of Holy Scripture - Volume I: St. Luke, Chaps. I to XII • Alexander Maclaren

... ever increasing in thickness, is spread out, moistening and enriching the soil and conserving the waters of the increased rainfall. A thousand living springs of pure, sparkling water make glad the plains and valleys. The evils of flood, erosion and drouth are checked; the climate made more congenial; the value of both hill and mountain, as a source of wealth, ...
— Solaris Farm - A Story of the Twentieth Century • Milan C. Edson

... a discovery at the source of that little tributary, where the erosion of the glacier had opened a rich vein, and on following the stream through graywackes and slate to the first gravelled fissure, he had found the storage plant for his placer gold. He was on his way out to have the claim recorded and get supplies and mail when he heard the baying setter and, ...
— The Rim of the Desert • Ada Woodruff Anderson

... a canoned channel whose banks rise three hundred feet above its bed. They are twin cliffs that front one another, their facades not half so far apart. Rough with projecting points of rock, and scarred by water erosion, they look like angry giants with grim visages frowning mutual defiance. In places they approach, almost to touching; then, diverging, sweep round the opposite sides of an ellipse; again closing like the curved handles of callipers. Through the spaces thus opened the ...
— The Death Shot - A Story Retold • Mayne Reid

... which had an average thickness of nearly three hundred feet, and a breadth varying from rather less than two miles to four miles? The river, though it has so little power in transporting even inconsiderable fragments, yet in the lapse of ages might produce by its gradual erosion an effect, of which it is difficult to judge the amount. But in this case, independently of the insignificance of such an agency, good reasons can be assigned for believing that this valley was formerly occupied by an arm of the sea. It is needless in this work to detail ...
— A Naturalist's Voyage Round the World - The Voyage Of The Beagle • Charles Darwin

... erosion from overgrazing and other poor farming practices; desertification; dumping of raw sewage, petroleum refining wastes, and other industrial effluents is leading to the pollution of rivers and coastal waters; Mediterranean Sea, in particular, becoming polluted from oil wastes, soil erosion, and fertilizer ...
— The 2000 CIA World Factbook • United States. Central Intelligence Agency.

... to do with change," she said. "And with evolution. Look at this scarred mountain-side, how confused and senseless the upheavals seem which have given it its grandeur! Nor is it static yet. It is continually wearing down. Erosion is diminishing it, that river is denuding it. Eternal ...
— The Precipice • Elia Wilkinson Peattie

... have ended in another half-minute had the struggle not been at the very edge of the bank. Undermined by the erosion of the spring floods, a section of this bank suddenly gave way, and with it went Baree and half the pack. In a flash Baree thought of the water and the escaping caribou. For a bare instant the cave-in had set him free of the pack, and in that space he gave a single ...
— Baree, Son of Kazan • James Oliver Curwood

... been advanced to account for the origin of the Grand Canon, but it is a question whether it is altogether due to any one cause. Scientists say that it is the work of water erosion, but to the layman it seems impossible. If an ocean of water should flow over rocks during eons of ages it does not seem possible that it could ...
— Arizona Sketches • Joseph A. Munk

... tendency to high blood pressure, great mental activity associated with frequent and severe headaches (often of the migraine type), a combination of initiative and irritability and a marked sexuality. X-ray examination of the sella turcica shows what is called erosion of the bone as it yields to the pressure ...
— The Glands Regulating Personality • Louis Berman, M.D.

... The house was located on the John Day River about a mile below the mouth of Bridge Creek. Opposite the house the river makes a sudden bend around the point of a high mountain, where the action of water and erosion of time had washed away the base of the mountain leaving a precipitous cliff, hundreds of feet high. Under this cliff a great amount of drift wood has been deposited, and here Jim Clark went for his fire ...
— Reminiscences of a Pioneer • Colonel William Thompson

... is no objection to Samana in respect to size, position or shape. That it is a little island, lying east and west, is in its favor. The erosion at the east end, by which islets have been formed, recalls the assertion of Columbus that there it could be cut off in two days ...
— The Life of Christopher Columbus from his own Letters and Journals • Edward Everett Hale

... intersecting valleys and transverse ranges, dense with the growths of primeval wildernesses, and rugged with the tilted strata of great upheavals, and with chasms cut in the solid rock by centuries of erosion, traces of some remote cataclysmal period, registering thus its throes and turmoils. The blue sky, seen beyond a gaunt profile of one of the farther summits that defined its craggy serrated edge ...
— The Phantoms Of The Foot-Bridge - 1895 • Charles Egbert Craddock (AKA Mary Noailles Murfree)

... remark, are basaltic, and therefore plutonic. An area, as large perhaps as Sussex, has been lifted up en bloc with all its living contents, and cut off by perpendicular precipices of a hardness which defies erosion from all the rest of the continent. What is the result? Why, the ordinary laws of Nature are suspended. The various checks which influence the struggle for existence in the world at large are all neutralized or altered. Creatures survive which would otherwise disappear. You will ...
— The Lost World • Arthur Conan Doyle

... only be disintegrated by the slow process of erosion. Joseph Parker's work in London tended to make all English clergymen who desired freedom, free. For over twenty years he preached every Thursday noon, and often twice on Sunday. No topic of vital human interest escaped him. He ...
— Little Journeys to the Homes of the Great, Volume 9 - Subtitle: Little Journeys to the Homes of Great Reformers • Elbert Hubbard

... professed exercise by a State legislature of its police power; and in the case of legislation affecting the remedial rights of creditors, it still affords a solid and palpable barrier against legislative erosion. Nor is this surprising in view of the fact that, as we have seen, such rights were foremost in the minds of the framers of the clause. The court's attitude toward insolvency laws, redemption laws, exemption laws, appraisement ...
— The Constitution of the United States of America: Analysis and Interpretation • Edward Corwin



Words linked to "Erosion" :   geologic process, geology, corrasion, chatter mark, geological process, deflation, rust, indentation, diminution, chemical change, decline, chemical action, attrition, detrition, environmental condition, erode, planation, ablation, roughness, wearing away, corrosion, abrasion, rusting, pitting, chemical process



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