what two landforms creates deposits from rivers?
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Delta\nA delta is a landform where the mouth of a river flows into an ocean, sea, desert, estuary 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 characterized 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\n Estuaries\nEstuaries are aggrading depositional sedimentary bodies at the mouths of rivers. Many present river mouths became estuaries after the post-glacial sea-level rise inundated the former deltas. When that happened, fluvial channels became subject to tidal influence. Especially in meso- and macro-tidal regimes, the fluvial processes became subordinate to marine redistribution and tide-dominated estuaries could form.
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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.
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Nothing. The river just flows from it. If it has multiple sources or headwaters, however, then the actual river flows from the largest or main source, and is connected to the other headwaters through tributaries.
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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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Rivers empty into major bodies of water...tributaries empty into rivers
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"A landform comprises a geomorphological unit. Landforms are categorised by characteristics such as elevation, slope, orientation, stratification, rock exposure, and soil type. Landforms by name include berms, mounds, hills, cliffs, valleys, and so forth."  (www.ask.com)\n\n"A basin-shaped desert region covering about 360,000 square miles (930,000 square kilometers) in southern Africa, the Kalahari desert is bounded by the headwaters of the Zambezi River to the north, the plateaus of the Transvaal and Zimbabwe to the east, the Orange River to the south, and the highlands of Namibia to the west. The only landforms rising above the relatively uniform Kalahari are occasional smooth rocks that form hills in the southeast, southwest, and northwest. Long chains of crescent-shaped dunes characterize the entire western part of the Kalahari. The Kalahari lies about 3,000 feet (900 meters) above sea level." (http://www.britannica.com/ebi/article-9275213)\n\nThere are at least 3 landforms mentioned there.  I found this information in less than 1 minute.  You can too.  Now that you have the headstart, get to work and do your own research.
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alluvial (or in the propector's lingo a "placer deposit")
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well, there is the theory of plate tectonics which tells us that the earth's crust is comprised of plates that converge, spread, subduct,  and slide with one another.  This is the main culprit of orogeny, which is mountain building.  Then you have to consider weathering which is performed mainly by wind and water, ie..rivers, lakes, streams, ocean currents and tides.  Once that has taken place erosion takes effect and carries the weathered material away and deposits it somewhere else.
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Air masses form over parts of the earth's surface called source regions, which are large bodies of water or landmasses with relatively uniform topography, often ranging hundreds of thousands of square miles in area.
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Sedimentary rock, for the most part, is created from sediment in large bodies of water.  The large land masses that are coated in sedimentary rocks were once the beds of large bodies of water.
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Eons ago there were rivers\n\nTh
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As a river flows to the sea, it carries huge amounts of sediments from upstream.  These sediments are deposited at the mouth of the river in a fan shaped (triangular) pattern.  Deltas form at the mouth of rivers. Oceans do not have mouths. For example, the Mississippi River delta forms in southern Louisiana where the river ends in the Gulf of Mexico.  The Nile, and the Ganges–Brahmaputra both have large river deltas.\n\nThe delta is a mix of fresh water from the river and salt water from the sea.  Deltas form all over the world, in all climates.  Much of a delta is marshy soil subject to tides and frequent flooding.  This is the habitat for many species of birds, fish, insects, and other animals.  The soil can be very fertile and support a variety of plants and grasses.\n\nTo study the plant and animal life in the delta, pick a particular river, and study it's particular delta.
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because weathering breaks down rocks     in time it will bring down mountains      weatheing makes streams    plants use stream water    weathering makes rivers   and if not makes them it makes them bigger wich makes water more conveinient   and in old times rivers were the main and/or only way for travel to great distances and trade.    and thats just a tiny little detail me brother 11 yr old brother just thought of
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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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When it rains and the rain hits mountains or other materials it cannot sink through small trickles appear in the direction of the downslope. The trickles come together eventually and pour looser materials with them (such as sand or loose earth for example). Eventually they can form a big enough stream to be a river. When a river runs with high speed it tends to have a straighter path, but if it becomes wide and slow it starts bend like a serpentine.
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Topography is the word you want. Combine Topography with river and throw it into a search engine and things like this Wikipedia article should fall out.  Happy hunting.
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The rivers are cresting and there is a lot of standing ground water that will slowly be absorbed or drain off.