What is a river valley?
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A valley created by the ancient flow of a river.  As the rived flowed it eroded and dug the valley over time.
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A tributary (or confluent/affluent) is a stream or river which flows into another river (a parent river) or body of water but which may not flow directly into the sea. In orography, tributaries are ordered from those nearest to the source of the river to those nearest to the mouth of the river. A confluence is where two or more tributaries or rivers flow together.\n\nThe descriptive terms right tributary and left tributary always apply from the perspective of looking downstream (in the direction the current is going), similarly to the river banks.\n\nThe opposite of a tributary is a distributary; a river branch that flows away from the main stream. A river and all its tributaries drain the watershed of the river
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have you been to google lately???\n\nDo you mean 'Down by the River'?
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Ordinary high water line is where normal vegatation stops and river gravel or stone begins.  You're neighbor needs to be educated, which will be impossible if he's NASCAR fan.
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The valley is formed from rifting, so a streching of the crust creates an opening.  This also creates high mountains around the valley.  These mountain erode and this sand, gravel and mud is deposited into the new valley.  THey are transported mainly via streams and rivers, which all combine to form the Rio Grande River itself.
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From the River's Mouth
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Lakes, river, ponds, streams
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a tributary or a distub thingy
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Missouri Valley is great!!
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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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Most rivers are fresh water.
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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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hydropower comes from water, typically through a river that has been dammed to harness the power of the water.
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A river is the main body of water, the tributaries are smaller streams etc that branch off it or into it...\n\nLike a tree... the trunk is the river, the branches are tributaries..
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Either a valley (both sides going down to a common 'low point' of the V) or a ridge (both side going up to a common "high point" of the V) depending on which way the V runs in relation to the topo lines.
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A delta - : something shaped like a capital Greek delta; especially : the alluvial deposit at the mouth of a river
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Tributary may refer to the following:\n\nTributary, a stream or river which flows into another river (a parent river) or body of water but which may not flow directly into the sea \n\nTributary (political), a dependent that pays tribute