Where did the sediments come from that forms the aquifier?
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What is usually meant by an aquifer is a given formation that contains potable water.  There are many aquifers in the world.  A formation could be made from almost any kind of sediment that is both porous and permeable.  In other words, as long as the sediment contains spaces that allows it to hold water, and those spaces are connected together which allows the water to flow.\n\nAs to where the sediments come from, there are various possible sources.  Sediment is the pieces and fragments broken from other rocks.  These other rocks can be igneous (volcanic), metamorphic or even other sediments.  Sedimentary rocks can even be laid down by chemical processes.  \n\nA sediment's orginal composition depends almost entirely on what minerals the parent rock contains.  As a sediment is buried it is compressed, de-watered and heated.  The fragments may become cemented together and turned to rock.  This process is known as diagenesis.  Some of the original mineral are lost as they are turned  to clay during this process.  In order for a rock to be an effective aquifer however, the clay content should be low, as too much clay will lead to the blocking of the passages between the pores.\n\nQuartz, the mineral that makes up common sand, is resistant to chemical alteration, so sandstone is a common (but by no means the only) aquifer rock.
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aquifers, undergound streams, etc. anything under ground
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http://www.mbr-pwrc.usgs.gov/bbs/anim/h3520.html
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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.
193750
This is due to the seawater having a greater heat capacity than the land, thus they heat and cool off at different rates, causing pressure differentials in the air above them. See the source for details.
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Salt comes from  dissolved rock. Rivers carry that salt from the land to the ocean. It's that simple.
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Before the pineapple plantations, a geologists discovered the large aquifer(Maui Oahu?) and drilled for the artisan well. It is dry where the plants are, wet on the other side of the mountains where it feeds the groundwater.
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I think this guy is talking about bentonite.  It's an expanding, ultra-low permeability clay that comes in pellets or chips (dry, of course).  We use it in the environmental business to seal between groundwater layers.
71958
muromets is correct. You can model this yourself using clay. On a cookie sheet, put a half inch of water. On top, put a 1/2 layer of rolled clay. This is what the earth was liked pre-flood. The earth was watered from below. Now break open the center and the water will burst forth (as Genesis describes) and now the clay is covered by the water as the clay sinks. Now pull the clay out toward the corners and the water will display into seas.\nIn order for the continental drift to occur properly, the earth would have had to expand, thus making physics of the covering of the earth with water and its later displacement to be quite possible.
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Jetties and sea walls cause sand and silt to be deposited on their down-current side.  Example: The long jetty near the airport.\n\nWetlands are drained for development thus removing the buffer that wetlands provide against storm surges and flooding.  Example: Burnt Bridge Creek area - Lacamas Creek Enterprises Inc. filled approximately 1.2 acres of wetlands
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Sedimentary rocks are formed at the surface of the Earth, either in water or on land. They are layered accumulations of sediments: fragments of rocks, minerals, or animal or plant material. Temperatures and pressures are low at the Earth's surface, and sedimentary rocks show this fact by their appearance and the minerals they contain. Most sedimentary rocks become cemented together by minerals and chemicals or are held together by electrical attraction; some, however, remain loose and unconsolidated. The layers are normally parallel or nearly parallel to the Earth's surface; if they are at high angles to the surface or are twisted or broken, some kind of Earth movement has occurred since the rock was formed. Sedimentary rocks are forming around us all the time. Sand and gravel on beaches or in river bars look like the sandstone and conglomerate they will become. Compacted and dried mud flats harden into shale. Scuba divers who have seen mud and shells settling on the floors of lagoons find it easy to understand how sedimentary rocks form. \n\nExamples:\n\nArkose \nBreccia \nChalk \nChert \nClaystone \nCoal \nConglomerate \nCoquina \nDolomite \nEvaporite \nGreywacke \nLimestone \nMarl \nMudstone \nOolite \nSandstone \nShale \nSiltstone \n\nFor more check :\n\nhttp://interactive2.usgs.gov/learningweb/explorer/topic_rocks_sedimentary.htm\n\nhttp://en.wikipedia.org/wiki/Sedimentary_rocks\n\nhttp://en.wikipedia.org/wiki/List_of_rocks
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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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That's completley dependant on what the contaminant is, how large of a site it is, and the site location.  you should consult both a civil and an environmental engineer for the specifics
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Lots of regular gravel and sand of different sized granuels. They use finer material thedeeper in the leech pit you go until you will eventually get clean water out the other side. (Hopefully)
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Erosion breaks up igneous and metamorphic rocks, and the particles build up to create sedimentary rocks.  \n\nHope this is helpful.
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Particulates from 'smoke'.\nSoil that has been eroded by the wind.\nSalt crystals lifted off the sea.\nPollen\nSeeds from plants such as dandelionor orchids.\nWindborne microbes or their spores.\nAnimals, mainly birds and insects, but also spiders and other animals that are blown from place to place.\n\n\n________\n\n>>>> none they are all gases\n\nYeah, like all the material in the ocean is a liquid, right? And all the material in the ground is a solid?\n\nDid you even stop to think before answering?
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It's called a river delta. For example, the Mississippi Delta, the Nile Delta, etc. You could also be referring to a river channel mouth bar, which is only a small part of a delta found where the water speed slows from the opening up of the channel into the open ocean, thus causing the water to drop its sediment load.