Understanding river

The river is fresh water on the Earth's surface. The water flow is derived from the high to the lower part, the two sides bounded by the creek bank. The river is divided into three parts, as follows:1. upstream part, the part that is close to the springs, discrete, flow heavy, vertical erosion, V-shaped trough, there is a waterfall, almost no precipitation.2. the middle, between the upstream and downstream, has a moderate flow characteristics, vertical and horizontal erosion, there is precipitation, a U-shaped trough3. downstream, the part near the mouth of the river flow is characterized by slow, there are a lot of sediment, large U-shaped trough, horizontal erosion, there meanders or meandering streams.
Various kinds of river1. by Origin springs- River of rain, the river springs from the rain- Glacier rivers, namely river springs from the snow or ice that melts- Creek blend, the river springs from rain and melting glaciers or ice.
2. based on the amount of flow- Permanent river, the river still flows throughout the year- Periodic river, the river flow is not fixed throughout the year
3. by genetic or river stage- River consequently, the flow direction of the river slope- Subsequent river, the river that flows perpendicular to the river consequent- Obsekuen river, the river flow is opposite to streams consequent- Resukuen river, the river flow direction of the river consequent- Insekuen river, the river flow is irregular direction
4. based on the flow pattern- Pinanate, the river flow pattern that forms an acute angle- Dendritic, the river flow pattern resembles the shape of a tree- Trelis, the pattern in which the tributary streams to form a right angle with the main river- Parallel, the flow pattern of the river between the river almost parallel to each other- Radial sentripugal, the pattern of streams leaving the center- Radial centripetal, ie the pattern of river flows towards the center- Regtangular, the river flow patterns that form a right angle- Brided, the river flow patterns punctuated with lakes hose- Sinkholes, the river flow pattern abruptly disappeared. Usually found in limestone areas.