wats river erosion n wat r d factors affecting it?????????
925480
WHAT??\n\nwhat GD language was that?\n\n\ntry THINKING then POSTING moron.
648405
the last answer is correct, but misses out the effect they CAN have on wildlife in the river. fish cant migrate ect
161011
River morphology (shape) is controlled by a number of characteristics. River channels can be broken into three types, straight rivers, single channel meandering rivers, and braided rivers (multi-channel). The amount and size of the sediment the river carries, the slope of the river channel, and the amount of water in the river determine the shape of the river channel. \n\nStraight rivers tend to have the lowest sediment load and the lowest slope. Meandering rivers have slightly more slope, and much more sediment load, and braided rivers have both the highest slopes and greatest sediment loads. \n\nRiver channels in cross section often have a cup-like  shape with the deepest portion, known as the thalweg, found on one side or the other. This thalweg has the highest flow velocity and because it flows faster it can cut into the bank it is closest to, while the shallow part of the river slows down and drops sediment. This action causes both meandering rivers and braided rivers to move their channels from side to side in a valley over time. Straight channel rivers also have thalwegs that move but the effect is much less. \n\nAs rivers go from mountainous terrain to nearly flat valleys they change from braided streams and rivers to meandering rivers. As they approach sea level they form deltas where the flow often separates into separate branching channels. A great deal of the sediment load of the river is deposited on the delta, and as the river flows into the ocean it builds the delta outward. Rivers like the Mississippi have built deltas far out into the ocean with sediment piles that are several miles deep.
411537
The hydrolic cycle is the main cause of erosion.  Rain soaks into the ground.  To much rain can saturate the ground with water, and if there are not enough plants the rain soaked land can be too heavy and you will get mud slides.  Rain also forms runoff in the forms of streams, creeks, rivers and deltas.  Erosion occurs in all these forms of runoff.  It can be good because minerals are pulled from the dirt and redistributed for better farm land.  However erosion can also cause disasters like what happened in New Orleans after Katrina.  Erosion had caused the entire city to sink below sea level, so when the dikes collapsed the water flooded the city.
357191
I am a petroleum engineer and i will answer u from my experience:(2 months....... ;))\n\n-Long distance of travel= More rounded and well sorted\n-short distance= more angular and less sorted\n\nTravelling agent:\n-Rivers= very small grained rocks at the end of the river...and coarser grains while approaching the begin of the river....due to settling\n\n-Wind=fine grain (Sand size) but more angular\n\n- Waves= The same effect like rivers but coarser grains at shores due to harsh environment...very fine at overseas and deep depths due to very calm water there so small particels can settle........ \n\nBye..hope that i did not forget something..and hope to contact u for overseas friendship......;)
476271
chemical erosion (dissolving elements from the rocks) deepen the cracks between the rocks creating the pavement effect
720397
Wind and water erosion both erode top layes of the soil which is fertile.\nBoth can be controlled by planting trees over loose soil so that the roots can prevent soil erosion.\n\nBut water erosin is much more harmful since it can cut up land and make it unfit for cultivation, and water erosion can only take plaec where there is a slope.
1089980
Water\n\nSplash erosion is the detachment and airborne movement of small soil particles caused by the impact of raindrops on soil. Sheet erosion is the result of heavy rain on bare soil where water flows as a sheet down any gradient, carrying soil particles. Where precipitation rates exceed soil infiltration rates, runoff occurs. Surface runoff turbulence can often cause more erosion than the initial raindrop impact. Gully erosion results where water flows along a linear depression eroding a trench or gully.\n\nValley or stream erosion occurs with continued water flow along a linear feature. The erosion is both downward, deepening the valley, and headward, extending the valley into the hillside. In the earliest stage of stream erosion, the erosive activity is dominantly vertical, the valleys have a typical V cross-section and the stream gradient is relatively steep. When some base level is reached the erosive activity switches to lateral erosion which widens the valley floor and creates a narrow floodplain. The stream gradient becomes nearly flat and lateral deposition of sediments becomes important as the stream meanders across the valley floor. In all stages of stream erosion by far the most erosion occurs during times of flood, when more and faster-moving water is available to carry a larger sediment load. In such processes, it is not the water alone that erodes, suspended abrasive particles, pebbles and boulders can also act erosively, as they traverse a surface.\n\nWind\n\nWind erosion, also known as eolian erosion is the movement of rock and/or sediment by the wind. Windbreaks are often planted by farmers to reduce wind erosion. This includes the planting of trees, shrubs, or other vegetation, usually perpendicular or nearly so to the principal wind direction. The wind causes dust particles to be lifted and therefore moved to another region. Wind erosion generally occurs in areas with little or no vegetation, often in areas where there is insufficient rainfall to support vegetation. An example is the formation of sand dunes, on a beach or in a desert.\n\nGlacial\n\nIce erosion is caused by movement of ice, typically as glaciers. Glaciers can scrape down a slope and break up rock and then transport it, leaving moraines, drumlins and glacial erratics in their wake, typically at the terminus or during glacier retreat. Ice wedging is the weathering process in which water trapped in tiny rock cracks freezes and expands, breaking the rock. This can lead to gravity erosion on steep slopes. The scree which forms at the bottom of a steep mountainside is mostly formed from pieces of rock broken away by this means. It is a common engineering problem, wherever rock cliffs are alongside roads, because morning thaws can drop hazardous rock pieces onto the road.
724076
Cnatthink of one but try some geography sites\n\nold rivers have lots of ox bows and meanders from sidecutting \n\nnewer rivers are generally straighter and dont have as large floodplain and also maybe more braided
860373
The most important change would be with the weather, for example California would have more rainfall but the east would have substantially less. This would also cause a shift in the ocean currents and the vast rivers under the oceans could be reversed causing further climatic change.
635228
Very complicated answer - sorry... you'll need to spend time reading these links.  the term is "erosion" - These will get you started.....\n\nhttp://www.igsb.uiowa.edu/browse/glacflds/glacflds.htm\n\nhttp://www.afrol.com/News2002/nig002_floods_erosion.htm\n\nhttp://www.mnr.gov.on.ca/MNR/water/p766.html
694469
Try this link\nhttp://en.wikipedia.org/wiki/Amazon_river
1179874
(1) There are several factors which make environmental problems. Some of them are mentioned below for your knowledge.\na) Overcrowding, poor-quality housing\nb) Inadequate provision for water supply\nc) sanitation factors\nd) Different pollutions( air, water, land)\ne) Deforestation\nf) Smoke from vehicles and  factories\n\n(2) In addition to that, secondary impacts of the above mentioned factors are also make environmental problems.
934319
Erosion is caused mainly by inadequate handling of the ground (but it is a natural process). It depends on the composition of the soil (more sands, more erosion; more clay, less erosion).\n\nTo prevent it, ' the main one is to keep the ground covered '.\n\nThe covering protects against the impact of rain, as an umbrella, preventing the torrent formation. It is important to reduce the speed of the draining of the water and its impact in the ground.\n\nIf the covering of the ground well will be made, with more than 30% of the covered surface, the risks of the erosion diminishes more than in 60%. The direct plantation is a good technique to be used too.
15775
The Mississippi River drains most of the North American continent and carries a huge sediment load of clay, silt, sand, and even gravel sized clasts all the way to its mouth. As the river opens into the ocean at the delta the velocity of the water slows and the ability of the river to carry sediments decreases, creating a huge sediment buildup at the mouth of the river. Other processes near the mouth of the river that gradually build the delta and coastal wetlands are from periodic flooding of the river. When the river flows over its banks during flood it carries these sediments out onto the flood plain where they settle out of the water. This process has been going on for millions of years and has built much of the coastal area of Louisiana, just as other rivers along the Gulf Coast have built the Texas shoreline and progressively moved it forward into the Gulf. \n\nThe Mississippi has not always been contained by levee systems, and when allowed to flow naturally the mouth of the river has migrated back and forth across the Louisiana coastal plain. At present there is speculation that the river, if allowed, would begin flowing across the Achafalaya area rather than taking the path it now takes to the sea. \n\nYou might be interested to know that the sediment pile created by the Mississippi River is over 30,000 feet deep along the Louisiana coastline.
610858
1) Farming can cause soil erosion: \ne.g. Deforestation removes roots holding soil and allows extensive wind and water damage. \n\n2) Farming causes desertification: \nThis is when a desert gradually spreads to the surrounding areas of semi-desert, making them true desert! \n\n3) Chemical pollution and habitat destruction are major problems: \nCareless use of fertilisers pollutes rivers and lakes, making them green, slimy and horrible. \n\n4) Irrigation can cause environmental problems:\ncreating dams involves flooding large areas. Wildlife habitats are destroyed and people have to be resettled! \n\nHope I helped!
379528
Friction and erosion.