CH 7 OUR COUNTRY – INDIA

The place where a river enters a lake, larger river, or the ocean is called its mouth.

Flowing over ground as runoff or underground as groundwater, water finds its way to a stream and then eventually to the sea. Why do rivers continue to flow, even when little or no rain has fallen? Much of the water feeding a stream runs slowly underground through shallow aquifers.

Although the terms erosion and denudation are used interchangeably, erosion is the transport of soil and rocks from one location to another, and denudation is the sum of processes, including erosion, that result in the lowering of Earth’s surface.

Mass wasting is the movement of rock and soil down slope under the influence of gravity. Rock falls, slumps, and debris flows are all examples of mass wasting. Often lubricated by rainfall or agitated by seismic activity, these events may occur very rapidly and move as a flow.

Definition: What is deposition? When a river is fast flowing, it can transport sediment. If the river slows down, then it can no longer transport sediment, and this material will begin to settle out of the water. This settling of sediment is called deposition.

Running water transports material in 3 ways: solution, suspension and by rolling and bouncing on the stream bottom.

Valleys, Gorges, Canyon As we discussed above, valleys are formed as a result of running water. The rills which are formed by the overland flow of water later develop into gullies.

There are three major subdivisions of geology, physical geology, historical geology, and environmental geology.

There are three major subdivisions of geology, physical geology, historical geology, and environmental geology.

The geological action of glaciers comprises erosion, transportation and deposition which together constitute what is known as glaciation. The geological action of glacier is mainly due to its flow.