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Topic: Erosion

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Soil erosion

Erosion prediction

Soils retrogression and degradation

Soil conservation

Stream

Phytoremediation

Cliff

Soil

Glacier

Sea wall

Stack (geology)

Rock (geology)

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	Soil Erosion Site
		Soil erosion by water, wind and tillage affects both agriculture and the natural environment.
		To a large extent this is because soil erosion does not fit neatly under any one heading: it is studied by geomorphologists, agricultural engineers, soil scientists, hydrologists and others; and is of interest to policy-makers, farmers, environmentalists and many other individuals and groups.
		It aims to be the definitive internet source for those wishing to find out more about soil erosion.
	www.soilerosion.net (0 words)

	Soil Erosion
		Wind and water are the main agents of soil erosion.
		POLITICS, ECONOMICS AND SOIL EROSION To understand soil erosion we must be aware of the political and economic factors affecting land users.
		On commercial farm lands, overstocking, mono-cropping, and the ploughing of marginal lands unsuitable for cultivation has led to soil erosion and desertification.
	www.botany.uwc.ac.za /Envfacts/facts/erosion.htm (773 words)

	Erosion - MSN Encarta
		Erosion transports rocky material after the process of weathering has broken bedrock down into smaller, moveable pieces.
		The overall effect of the wearing down of mountains and plateaus is to level the land; the tendency is toward the reduction of all land surfaces to sea level.
		Opposing this tendency are volcanic eruptions and movements of the crust of the earth that raise mountains, plateaus, and new islands.
	encarta.msn.com /encyclopedia_761555067/Erosion.html (623 words)

	Erosion - Wikipedia, the free encyclopedia
		Erosion is the displacement of solids (soil, mud, rock and other particles) by the agents of wind, water or ice, by downward or down-slope movement in response to gravity or by living organisms (in the case of bioerosion).
		Erosion is distinguished from weathering, which is the decomposition of rock and particles through processes where no movement is involved, although the two processes may be concurrent.
		What causes erosion to be severe in some areas and minor elsewhere is a combination of many factors, including the amount and intensity of precipitation, the texture of the soil, the gradient of the slope, ground cover (from vegetation, rocks, etc.) and land use.
	en.wikipedia.org /wiki/Erosion (2024 words)

	The Problem of Wind Erosion
		Lyles (1975) estimated that top soil loss from wind erosion causes annual yield reductions of 339,000 bushels of wheat and 543,000 bushels of grain sorghum on 0.5 million hectares (1.2 million acres) of sandy soils in southwestern Kansas.
		Wind erosion is a threat to the sustainability of the land as well as the viability and quality of life for rural as well as urban communities.
		Wind erosion is also a serious problem on cultivated organic soils, sandy coastal areas, alluvial soils along river bottoms, and other areas in the United States.
	www.weru.ksu.edu /problem.html (770 words)

	Erosion Summary
		Erosion is the reduction or breakdown of landforms exposed to the forces of weathering (disintegration and decomposition).
		Erosion is the displacement of solids (soil, mud, rock and other particles) by the agents of wind, water or ice, by downward or down-slope movement in response to gravity or by living organisms (in the case of bioerosion).
		Erosion is distinguished from weathering, which is the decomposition of rock and particles through processes where no movement is involved, although the two processes may be concurrent.
	www.bookrags.com /Erosion (3548 words)

	Erosion Control - Waterway and Wetlands Permits - WDNR (Site not responding. Last check: )
		Headlands (points) usually have relatively high erosion rates because the waves, currents, and ice attack from all sides and eventually transport the sediments to bays, where they are deposited.
		Erosion and the transport and deposition of sediments is a natural process along shorelines.
		Although it may be possible to install a simple erosion control structure by yourself, most techniques have technical standards for size, height, shape, underlayment, and placement of structures.
	www.dnr.state.wi.us /org/water/fhp/waterway/info-erosion.shtml (814 words)

	NABS - Natural Arch Formation
		Differential erosion and chemical exfoliation acting on the surfaces of a rock exposure frequently cause concave recesses in the rock.
		When erosion proceeds at two different rates at the same location, e.g., on adjacent rock surfaces, it is called differential erosion.
		Differential erosion contributes to the formation of natural arches in several ways, e.g., the undercutting of harder layers of rock that are supported by softer layers.
	www.naturalarches.org /archinfo/formation.htm (3151 words)

	10(w) Erosion and Deposition
		Erosion can be seen as a sequence of three events: detachment, entrainment, and transport.
		Erosion begins with the detachment of a particle from surrounding material.
		The erosion velocity curve is drawn as a thick line because the erosion particles tends to be influenced by a variety of factors that changes from stream to stream.
	www.physicalgeography.net /fundamentals/10w.html (1718 words)

	‘Inland’ Erosion Hazards: St. Kitts
		Rill and sheetwash erosion is mainly of consequence for farmers.
		As a land forming process, however, erosion is also very important in geomorphology, for its role in the development of slopes and stream courses and thus of natural landscapes.
		Erosion hazards are most commonly defined in relation to open land either under agricultural use or intended for an agricultural use.
	www.oas.org /CDMP/PGDM/hazmap/erosion/skerosum.htm (3144 words)

	Morphology - Erosion (Site not responding. Last check: )
		Erosion is one of the two basic operators in the area of mathematical morphology, the other being dilation.
		The mathematical definition for grayscale erosion is identical except in the way in which the set of coordinates associated with the input image is derived.
		We can also use erosion for edge detection by taking the erosion of an image and then subtracting it away from the original image, thus highlighting just those pixels at the edges of objects that were removed by the erosion.
	homepages.inf.ed.ac.uk /rbf/HIPR2/erode.htm (1579 words)

	Working in The Woods: Why Is My Forest the Way It Is:Soil Erosion
		Erosion occurring at a rate that exceeds the rate of natural erosion is called accelerated erosion.
		The amount of erosion that occurs is a response to the balance between gravity, which tends to move soil down slope, and the resistance of soils, rock and, vegetation, which tends to hold the materials in place.
		In general, natural erosion from forested lands is quite small because of the protective influence of the soil litter layer, which increases infiltration and, thus, minimizes overland flow to streams.
	www.cnr.berkeley.edu /departments/espm/extension/EROSION.HTM (2117 words)

	Soil erosion index
		The visible part is erosion, when soil particles leave the land, transported by gravity, water or wind.
		Erosion is the visible part of degradation, where soil particles are transported down-hill by the forces of gravity, water flow or wind.
		Soil erosion can be predicted from the kind of soil, what it is used for, how it is farmed, the lay of the land, and size of the field.
	www.seafriends.org.nz /enviro/soil/erosion.htm (308 words)

	GEOIN: Soil and sediment erosion
		BRIEF DESCRIPTION: Erosion, the detachment of particles of soil and surficial sediments and rocks, occurs by hydrological (fluvial) processes of sheet erosion, rilling and gully erosion, and through mass wasting and the action of wind [see sediment geochemistry and stratigraphy; stream sediment storage and load; wind erosion].
		Erosion, both fluvial and eolian (wind) is generally greatest in arid and semi-arid regions, where soil is poorly developed and vegetation provides relatively little protection.
		Estimates of erosion are essential to issues of land and water management, including sediment transport and storage in lowlands, reservoirs, estuaries, and irrigation and hydropower systems.
	www.lgt.lt /geoin/doc.php?did=cl_soil (1012 words)

	Soil Erosion
		Erosion is the gradual wearing away of land by water, wind and general weather conditions.
		Coastal dune erosion is the reactivation of sand movement because of loss of surface cover through uncontrolled and/or excessive recreational activity.
		Stream bank erosion occurs when streams begin cutting deeper and wider channels as a consequence of increased peak flows or the removal of local protecting vegetation.
	www.dpi.vic.gov.au /dpi/nrenfa.nsf/childdocs/-80E62E2EAB672EE24A256B520005A0AF-D2CE6E07DE84A2644A256B52000AA0A6?open (460 words)

	[Regents Prep Earth Science] Weathering, Erosion, Deposition, & Landforms: Erosion
		Erosion refers to the transportation of rock, soil, and mineral particles from one location to another.
		Erosion is different from weathering since erosion has the moving element.
		It usually takes many years for erosion to be noticed, such is the case with the Grand Canyon.
	regentsprep.org /Regents/earthsci/units/weathering/erosion.cfm (676 words)

	erosion. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Suspended sediment from erosion is one of the world’s greatest pollutants.
		Accelerated erosion from removal of acres of trees and vegetation, which diminishes the natural erosion protection, is becoming increasingly common in populated areas.
		Among the methods of preventing soil erosion are reforestation, maintenance of fallow strips, terracing, underdraining, ditching, deep plowing, and plowing across slopes rather than up and down.
	www.bartleby.com /65/er/erosion.html (439 words)

	Unit on Erosion Science Lesson Plan, Thematic Unit, Activity, Worksheet, or Biology or Chemistry Teaching Idea
		Erosion - the wearing away of the surface of the earth, continuous process.
		Learning about erosion will help children to not only identify one factor that sculpts the earth's surface, but students will also be able to strategize means to preserve our natural treasures.
		Erosion causes great personal and monetary damage each year due to landslides, overflowing rivers, acid rain, and extreme temperature changes.
	www.lessonplanspage.com /ScienceSSMDUnitOnErosion46.htm (2816 words)

	DVD Verdict Review - Erosion
		Erosion is the type of movie that the pseudo-hip love to congratulate themselves for liking.
		With Erosion, director Ann Lu seems to be exploring the idea of using escapism to avoid confronting one's problems.
		Erosion must have put their quality control guys to sleep before they got to the error.
	www.dvdverdict.com /reviews/erosion.php (1391 words)

	COMPOST UTILIZATION IN EROSION CONTROL
		Erosion is the detachment and movement of soil by moving water, wind or ice.
		Sheet erosion is the removal of a fairly uniform layer of soil from the soil surface by shallow overland flow.
		Erosion removes fertile soil rich in nutrients and organic matter, which reduces the ability of plants to establish, grow and remain healthy in the soil.
	pubs.caes.uga.edu /caespubs/pubcd/B1200.htm (2471 words)

	BBC - GCSE Bitesize - Geography \| Riverswater \| Erosion
		Erosion involves the wearing away of rock and soil found along the river bed and banks.
		Erosion also involves the breaking down of the rock particles being carried downstream by the river.
		Near the mouth of a river, in the lower course, erosion is lateral (horizontal or sideways).
	www.bbc.co.uk /schools/gcsebitesize/geography/riverswater/riverprocessesrev2.shtml (172 words)

	Geoindicators: Soil and sediment erosion (Site not responding. Last check: )
		BRIEF DESCRIPTION: Erosion, the detachment of particles of soil and surficial sediments and rocks, occurs by hydrological (fluvial) processes of sheet erosion, rilling and gully erosion, and through mass wasting and the action of wind [see sediment geochemistry and stratigraphy; stream sediment storage and load; wind erosion].
		Erosion, both fluvial and eolian (wind) is generally greatest in arid and semi-arid regions, where soil is poorly developed and vegetation provides relatively little protection.
		Estimates of erosion are essential to issues of land and water management, including sediment transport and storage in lowlands, reservoirs, estuaries, and irrigation and hydropower systems.
	www.gcrio.org /geo/soil.html (1012 words)

	Erosion control with Turfgrasses
		Erosion control is needed now more than ever with increased land clearing not for farms but homes, shopping centers, roadsides, landfill, reclamations sites of all kinds.
		Almost any plant can be used for erosion control; the most prevalent problem is choosing a coverage that grows fast and is adaptable to the area.
		Reclamation grasses are used in areas where erosion control and stabilization of the ground is a necessity.
	www.turfgrasses.com /info/erosion.html (951 words)

	Erosion
		The rate of downcutting by erosion was calculated to be about 8 inches per year between 1820 and 1930 (based on the total volume of sediment removed by erosion).
		In addition to downcutting, headward erosion (or erosion at the head of a canyon) caused the canyons to lengthen.
		Erosion occurs in many areas along the Georgia coast, but it is an important problem on a populated island like St. Simons.
	www.gpc.edu /~pgore/Earth&Space/GPS/erosion.html (2418 words)

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