what are alluvial soils, delta regions, oases, and wadis?
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alluvial soils - soil deposited by water: sediment deposited by flowing water, especially soil formed in river valleys and deltas from material washed down by the river.\n \n\nwadi - (1) mainly dry water course: a steep-sided watercourse in dry regions of North Africa and southern Asia through which water flows only after heavy rainfalls  (2) an oasis, especially in North Africa\n\n\noasis - (1) fertile land in desert: fertile ground in a desert where the level of underground water rises to or near ground level, and where plants grow and travelers can replenish water supplies.\n\n\ndelta - deposit of clastic** sediment where a stream enters a lake, river, or ocean.\n\n** clastic sediment is sediment consisting of fragments of minerals, rocks, and other material.)
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Aquatic\ncontinental shelf \nlittoral \nriparian \npond \ncoral reef \nkelp forest \npack ice \nhydrothermal vents \ncold seeps \nbenthic zone \npelagic zon
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Nile River\nSahara Desert\nEastern Desert\ncataracts on the Nile in the extreme south\nmarshes around Nile Delta region\nMediterranean Sea
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The mouth of the river meets a larger body of water.  A delta forms from sediment deposited at the mouth of the river.  Some coastal rivers flow into estuaries, where fresh and salt water mix.
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most plants that require fertile soil and alot of water live in a delta. human like to live in delta because they can grow good crops. so other animals that feeds on the crops like the grasshoppers live on the delta. There is really no fish that live in a delta because it is where a river meets the ocean and neither salt water nor fresh water fish want to leave their habitat and go to the other side. (just think about the beach, you dont see any fish)
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Mountain Ranges, Desert plains and Grasslands
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B.Clay\nClay is generally particles < 2 micrometres, sand somewhere around 100 micrometres, and gravel rather in the millimetre range.\n\nA. wind erosion\nToday's (Tuesday, 14th Nov 2006) weather news show nice satellite images with dust vanes across the Canary islands. Forecasts say that some of the fine dust might even reach South America with the Passat winds. The seas before the Sahara have high sedimentation rates of desert dust.\n\nD. O-horizon\nO for organic.
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The most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide), usually in the form of quartz which because of its chemical inertness and considerable hardness is quite resistant to weathering. However, the composition of sand varies according to local rock sources and conditions.
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given that they are rich in minerals and nurients from active stream deposition, there most common use is for farming and agricultural research. \n\nThe Canterbury Plains of New Zealand are a classic example of alluvial plains where extensive farming is carried out and also agricultural research from the nearby Lincoln University in Christchurch.
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< A delta is the mouth of a river where it flows into an ocean, sea, or lake, building outwards (as a deltaic deposit) from sediment carried by the river and deposited as the water current is dissipated. Deltaic deposits of larger, heavily-laden rivers are characterised by the river channel dividing into multiple streams (distributaries), these divide and come together again to form a maze of active and inactive channels.\n\nDelta formation: \nAt the final course of a river, when it enters the sea, it mixes with the surrounding water, and its velocity of flow is checked, causing it to deposit its load of gravel, sand, silt and clay. The first materials deposited are the gravel and sand, as they are by far the heaviest and coarsest. Next to be dropped is the silt. Because it is fine, the clay is transported in suspension quite far out in the sea. When salt water causes the clay to flocculate, it becomes heavier and sinks. As layers upon layers of alluvial materials are deposited, a platform of alluvium is built up and it eventually rises above the water, which can now be called the delta. The water then overflows the banks into different channels called distributaries, which build up their own levees. The vegetation that later grows on the alluvium stabilizes the delta.\nWhere delta formation is river-dominated and less subject to tidal or wave action, a delta may take on a multi-lobed shape which resembles a bird's foot. The Mississippi delta is an example of this type.\n\nThe most famous delta is that of the Nile River, and it is this delta from which the term is derived, because the Nile delta has a very characteristic triangular shape, like the (upper-case) Greek letter delta (Delta). Other rivers with notable deltas include the Ganges/Brahmaputra combination (this delta spans most of Bangladesh), the Niger, the Amazon, the Mississippi, the Sacramento-San Joaquin, the Rhine, the Rhône, the Danube, the Ebro, the Volga, the Lena, the Tigris-Euphrates, the Indus, the Krishna-Godavari, the Cauvery, the Irrawaddy, and the Mekong.\n\nIn rare cases the river delta is located inside of a large valley and is called an inverted river delta.
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The Coastal Lowland is a narrow strip of relatively low ground between the sea and the cliffs leading to the Plateau. \nhttp://www.well.com/~bubbles/lowland.html\n\nThe Coastal Lowlands border the entire coast. They are flat plains, less than 100 feet (30 meters) above sea level.\nhttp://www.britannica.com/ebi/article-200847
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First spelling... W H A T\n\nNext, your answer.  They are areas of deposition at the outlet or leveling area of a river called the flood plain.
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go www.google.ae  use key of civil engineering soil test.  also universities and colledges of civil engineering make the tests.
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Plutons, Dikes, and Sills
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Deltas and Estuaries are created at the mouths of rivers.\nAnother landform that is created close to the mouth of a river is an ox bow lake.
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The main parts of a river include a channel, in which the water flows, and a floodplain—a flat region of a valley on either side of the channel. Through the channel and floodplain, water and sediment—material transported by the river, such as sand and silt—are transferred from ridges and mountains to the sea or to a lake. A river starts on hillsides as small channels, or rills. The rills combine to make larger channels or tributaries that eventually come together, forming distinct streams. The largest channels formed by this convergence of tributaries are rivers, and they can carry large quantities of fresh water and sediment across continents.
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Hawaiian Islands                 Hawaiia, Maui\nPacific Coast                      Ocean Side, Solana Beach\nIntermountain Region         Denver, Logan\nRocky Mountains                Vail, Breckenridge\nInterior Plains                      Arkansas City, Huron\nCanadian Shield                 Kitchener, North York\nAppalachian Mountains      Mountain City, Birmingham\nCoastal Plains                    White Plains, Newton