very short essay on river
Answers
River is a very important soft water source. Our country India is naturally blessed to have many rivers.
In most of the cases, rivers start at the highest point in a particular area. Again, it’s very important source for fresh water. It’s quite surprising to know that rivers drain almost 75 percent of the earth’s land.
River is important because it’s a habitat for many civilizations. For some countries, river is the biggest route of transportation. Rivers often offer recreational opportunities. Farming or agriculture would have been greatly affected without it. You should also know that rivers are the vital carriers of many nutrients.
Answer:
When rain falls, part of it sinks into the ground, some is evaporated back into the atmosphere and the rest runs off as rivulets, brooks, streams and tributaries of rivers that flow down to the sea. This running water forms a potent agent for denuding the earth’s surface. Denudation is the general lowering of the earth’s surface.
This takes place because such agents of erosion as rivers, ice, wind and waves wear away the rocks and transport the eroded debris to lower land or right down to the sea. But erosion cannot take place unless the rocks are first weakened or shattered by exposure to the elements. Rain, frost and wind weather the rocks so that they can be eroded more easily.
Unlike glaciers and snow, which are confined to the cold and temperate latitudes; waves which act only on coastlines; winds, which are only ‘efficient’ in deserts; the effect of running water is felt all over the globe wherever water is present. Running water is thus the most important single agent of denudation.
The source of a river may be a spring, a lake or a marsh, but it is generally in an upland region, where precipitation is heaviest and where there is a slope down which the run-off can flow. The uplands therefore form the catchment areas of rivers. The crest of the mountains is the divide or watershed from which streams flow down the slopes on both sides to begin their journey to the oceans.
The initial stream that exists as a consequence of the slope is called the consequent stream. As the consequent stream wears down the surface by deepening its channel downwards, it is joined by several tributaries either obliquely or at right angles depending on the alignment and the degree of resistance of the rocks.
If the rocks are composed of homogeneous beds of uniform resistance to erosion, the tributaries will join the main valley obliquely as in sequent streams. The drainage pattern so evolved will be tree-like in appearance, and is therefore described as dendritic drainage, after a Greek word Dendron meaning ‘tree’ (Fig. 34).
On the other hand, if the rocks are made up of alternate layers of hard and soft rocks, the tributaries tend to follow the pattern of the rock structure. If the outcrops of the rocks occur at right angles to the main valley, the tributaries will join it at right angles as subsequent streams.
Explanation:
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