can someone give me a paragraph about how deltas are formed?
151849
< 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.
1163963
Do you mean the molecular composition or macroscopic composition? There would be too much to post here so I suggest you visit the following\n\nhttp://users.rcn.com/jkimball.ma.ultranet/BiologyPages/B/Blood.html#formation
654297
A star forms in a nebula which is a very large cloud of hydrogen gas.  hydrogen is the basic building block of the universe.  A prostar is formed when a portion of the hydrogen in the nebula is formed into a hydrogen ball by the pull of gravity.  When the molecules become close enough the friction of their bumping together causes heat.  If it were not for this heat production the prostar would be pulled into a clump by the force of gravity.  Once enough heat is formed in the core of the prostar (about 2 million degrees) hydrogen nuclei join together to form a helium molecule.  The reaction is 6 H >1 He + 2H  That means 6 hydrogens are needed for the process to proceed, but two hydrogen are reclaimed on the other side so the net rxn is 4h > 1 He.  This reaction is possible because of entropy or the conservation of energy.  It takes less energy to maintain one atom of Helium than 4 atoms of hydrogen.  In the sun this energy savings is 0.6% which radiates to the surface and is expelled as sunlight.  Within the Sun about 745,000 tons of Hydrogen is converted to Helium every second.  The balance of the pull of gravity (collapse) and the heat from nuclear fusion (expansion) keeps the star's size and shape constant.  Once this process begins the prostar becomes a star.  There are other nuclear fusion reactions untill the formation of iron.  This step does not give off energy but requires energy input.  At this step stars begin to cool and become a red giant.  This is the first step in the death of a star, resulting in the formation of a nova or a supernova depending upon the size of the star.  a smaller star will form a white dwarf and the larger star will form a neutron star or if large enough it may collapse into a black hole.  Gravity is the attraction of particle to particle between two objects.  This is how a black hole works.  It has an extreemly strong gravitational pull because the core is composed of a very large amount of compacted particles and each of those particles contribute to the gravitational attraction.
467968
Sedimentary rock forms relatively flat. Youngest always on top of the oldest. Just like a stack of newspapers if you were to accumulate them everyday.\n\nFolding from compressional stress is one. Rock is literally pushed together creating anticlines & synclines, upward folding & downward folding arches respectively.\n\nFaults can also do this. This can be accomplished through compressional (pushed together) or tensional (pulled apart) stresses.\n\nI am not too sure about this one but isostatic adjustment could possibly tilt rocks.\n\nHope this helps.\n\n:)
294350
During a supernova, all matter is reduced to its smallest particles.  The smallest being the electrons and Hydrogen ion(H+). At a signifigant distance from "Ground 0," there occures a cooling phenominom that is a naturalphysical event.  Thus heat is an extensive physical property of most matted.  At this point electrons and H+ begin unifying into Hydrogen atoms.  At an even greater point two Hydrogen atoms fuse to product a Helium atom.  So on and so forth.  When these select few elements getr far enough from, "Ground 0" they are cooled to the point that fussion is no longer a natural phenominon.  At this distance in this time, of the story, things like planets, astroids and meteors form in extremely large massed of these elements to form minerals.  When these stellar bodies form H2O (water) they are capable of forming gassious H2O, CO2, H2, O2 and vary importantly C-4.  This place is called Earth any you are there. For further tutorial an planetary evolution e-mail me at melecrs@yahoo.com
65202
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.
58110
It is quite simple really. There is no 'theory' as some of the posts have indicated. The earth is composed of a number of large plates, which move constantly (the Pacific Ocean today is spreading at 4-5 cm per year). As these plates move, they sometimes slide under one another. As this happens, the upper plate is lifted. This moves rock that was deposited in an ocean environment slowly upwards and often to the top of mountains. The process takes millions of years, so it is likely the rocks that contain the shells on the top of the mountain your husband refers to are tens of millions of years old, or older. \n\nA perfect example is Mount Everest, which has carbonate rocks (with shells) at the peak. Other examples are many parts of the Rocky Mountains in North America, and the Alps in Europe. The Sierra's in California also contain carbonate rocks in many places that did in fact originate in what is now the Pacific Ocean. It is not rare and not mysterious or theoretical. \n\nThe names of these processes, in case you want to learn more, are plate tectonics (previously called continental drift), subduction (one plate under another), orogeny (mountain building), and carbonate sedimentology( deposition of carbonate rocks).  I'm including some links with basic explanation of the concepts. \n\nAnimated illustrations of plate tectonics:\nhttp://www.ucmp.berkeley.edu/geology/tectonics.html\n\nIllustration of subduction:\nhttp://www.platetectonics.com/book/page_12.asp\n\nOrogeny:\nhttp://www.uwgb.edu/dutchs/platetec/orogeny.htm\n\nCarbonate sedimentology (great pictures of carbonates in mountains (sea shells):http://epswww.unm.edu/sed/home.htm\nOther carbonate sedimentology links:\nhttp://www.unige.ch/sciences/terre/geologie/w_groups/carbonate_sedimentology/webmain.html\n\nIf you want to see my explanation for how sea shells form in the ocean go to this question:\nhttp://answers.yahoo.com/question/index;_ylt=AiyMjODIRNiCqQ3uGA0_ICPsy6IX?qid=1006011004317
88754
It's a triangle, which is the capital Greek letter delta. It's the mathematical symbol for change. It looks like this: Δ
558194
To understand sedimentary rock layers, it is important to understand that the earth's surface is always slowly - but constantly - changing.  Mountains and other areas that are raised above the surrounding land are subject to wind, rain, and water which constantly wear them down.  The bits of sand, pebbles, and rubble that get worn down from mountains, mesas, and cliffs are pulled by gravity to the low-lying areas (valleys, lake beds, sea-shores) where they collect over time.  Over millions of years, these deposits can harden and petrify into sedimentary rock layers.  Other sedimentary rock layers (like limestone) form on ancient sea or lake beds and are the remains of the various animals and plants that lived in the water.\n\nThus when you look at the different layers of the Grand Canyon, you are looking at the petrified remains of what was once the surface of the earth (or the bottom of a sea bed) at a time the region was being covered with sedimentary material.  Different rock layers occur when changes to the environment cause one type of material to stop being deposited and new materials get deposited instead.  For example, a shallow sea may create layers of limestone.  If the sea later dries up and the now exposed sea bed gets covered over with blowing dry sand, then a layer of sandstone will be deposited on top of the limestone.  In this way, geologists can see how the surface of the earth changes at a given spot over time.\n\nAs for the specific rock layers in the Grand Canyon, here is a VERY SIMPLISTIC description of the situation and processes that produced the major rock layers (from the oldest layer at the bottom to newest at the top):\n\nVishnu Schist (bottom) - 1.7+ billion years ago the area around Grand Canyon was a series of volcanic islands surrounded by a shallow sea.  The resulting deposits of ash, sand, and mud created shales, sandstones and mudestones that were eventually compressed and distorted with time and pressure into gneiss and schist.\n\nTapeats Sandstone - There is a long period where the rocks from this area did not survive and so no record is left (the Great Unconformity).  Eventually this area became part of the edge of the still forming North American continent.  Sandy beaches in this area around 540 million years ago created this sandstone formation.\n\nBright Angel Shale - The water moved further inland, causing this area to be frequently underwater and covered with deposits of mud (which is where shale comes from).\n\nMuav Limestone - The water got deeper and the area became part of the sea-floor proper leading to limestone deposits.\n\nFollowing the Muav Limestone, the sea appears to have receded and the land was again above water.  Little is left from this period.\n\nRedwall Limestone - Around 363 million years ago, the sea moves in rapidly again and the area is once again part of a sea floor leading to limestone deposits.\n\nSupai Group and Hermit Shale - This is actually a lot of smaller layers (a mix of shales, mudstones, and limestones) created as the sea came in and went out numerous times over a period of 30 million years.\n\nCoconino Sandstone - The seas pulled back and this part of North America became part of a vast sand-dune filled desert (similar to North Africa).  The Coconino Sandstone is the petrified remains of ancient sand dunes.\n\nToroweap Formation and Kaibab Limestone (top of canyon) - The sea came back and turned the area first into shallow mud flats (Toroweap) and then drowned it completely into a sea floor (Kaibab) about 240 million years ago.\n\nOne frequent related question... how can Grand Canyon rock layers be from the bottom of a sea when the canyon rim is at 6000+ feet elevation, did the water get that high?  The answer is no... at the time that the sea floor deposits were created, this part of North America was much lower (ie: below sea level).  \n\nThe reason you can find limestone rock layers with fossil fish and clams at high elevations above current se
724209
Delta Hf = Delta Hf of the products - Delta Hf of the reactants\n\nThe Delta H's of pure species in their natural form are zero. That means that O2 and H2 will have delta Hf's of zero.\n\nThe other values you have to look up.\n\nOverall it will be...\n\nDelta Hf = 2*Delta H of CO - 2*Delta H of CH4\n\nThe twos are the stoichometric coefficients.
373784
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.
708599
http://www.science.uwaterloo.ca/~cchieh/cact/c120/dotstruc.html
505010
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)
748839
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.
786689
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
1134961
This one is a little difficult to answer, but to the best of my knowledge this is a website that will get in depth to what they are and how they form.  I hope this information helps you.;
324857
Found a good diagram here\nhttp://www.laynetworks.com/Block%20diagram%20of%20the%20Pentium.htm