Friday, August 27, 2010

POWER OF RUNNING WATER


In order to understand the Yellow River, you need to briefly understand the basics. Here is the basics you should know:

The course of a river refers to the path along which it flows. The river winds round the hard rocks in the upper course and lower course. The river winds round hard rocks in the upper course but less winding in the middle course and the lower course. The river winds more in the middle course, forming big curves called meanders. It is extremely winding or meandering in the lower course.

The features found along a river’s course depend on whether erosion or deposition is more dominant. Erosion is the process whereby the rivers breaks down rocks and carries or transports them away. The rocks are eventually broken down to fine sand and silt, known as alluvium. Some rocks are broken down when their minerals are dissolved by the running water. All the rocks, sand and silt and dissolved minerals carried by the river are termed the load of the river. The heavier materials are left behind when the water flow is slow. The process by which heavier materials are left behind is termed deposition.

Because of erosion, the river craves out a lowland area in the highlands termed a river valley. The valley is the work of the running water. How deep or wide a valley is depends on the force of water, which is determined by the speed of the water flow, and the slope of the land it is flowing through.


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