What are the rivers?
The rivers are called natural water flows, which flow in the developed channel and are fed by surface and underground runoff from their basins. Any river has a mouth or delta. Those with tributaries form a system of rivers. It is believed that its character and development is influenced by the climate, relief, geological structure and size of the basin - the surrounding area from which the flow comes. The boundary that extends between river basins is called the watershed. So what are the rivers?
Geographers focus on the individual characteristics of the rivers. Among them: the structure of the flow depending on the power sources, water content, type of water regime, the catchment area, the length of the river, the width and depth of its bed, the slope of the water surface, the flow rate of water, the chemical composition of water, its temperature, and much more.
All rivers are classified by geographers into three types:
- Mountain rivers.
- Rivers flowing in narrow valleys with active currents.
- Plains with a slow current and valleys in the form of terraces.
Most often the rivers are also divided by size.The small ones include those whose length does not reach 200 km, and the catchment area is 3000 square meters. km Often, streams are divided into a separate group, relating to them small streams with a length of less than 10 km. Small also consider the river, the basin of which is located in one zone of geography. In everyday life, the concept of “small rivers”, as a rule, is used to address all rivers of local importance to a large region or across a country. For example, Istra.
The main difference between small and medium-sized rivers is that these types of rivers themselves drain the groundwater of their own river basin. The flow of precisely such rivers most characterizes the conditions of the zone of its formation. In the central zone of the Russian Federation, the upper limits of the area and length of the catchment area of small rivers are considered to be a good criterion for the degree of completeness of groundwater drainage. A vivid example of such an average river is Moscow.
A large river flows at a distance of several geographic zones. Its runoff is transit within certain geographical areas, such as, for example, the Volga in Astrakhan. Plain rivers with a catchment area of more than 50 thousand km were conventionally in the category of large rivers.2.
Whatever reference system is used, the majority of small rivers.They account for almost 99% of the total number of rivers of the Russian Federation (there are more than two million of them) and more than 90% of their length.
What are the rivers
Vast attention has always attracted large rivers. The Amazon is considered to be the most aquifer in the world, followed by the Congo, then the Gangs, then the Brahmaputra, the Yangtze and the Yenisei. The longest rivers in the world are the Nile (although it is not part of the most aquifer, because most of its way flows through the Sahara), it is followed by the Mississippi from Missouri and, finally, the Amazon.
The most aquiferous rivers in Russia are Lena, Yenisei and Ob. But the largest river in Europe - the Volga takes only fifth place. Favorite writers Don - 19th. This is explained by the fact that it is poorly endowed with the resources of the river flow of its steppe zone - the area within which it is formed.
On the Internet you can also see what types of rivers still exist in nature.
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