Many rivers are formed when rain flows down from hills but sometimes the source is a lake, sometimes it is a marsh or a bog and sometimes it is a spring where water comes up from the ground. The source of a river is the furthest point on the river from its mouth. Meanders may be present though they will not be as "curvy" as those found in Old Age Rivers. When the river tumbles at steep angle over very hard rocks or down a steep valley side, it forms a waterfall. 9. A river’s channel is eroded laterally and vertically making the channel wider and deeper. There is more water in the stream channel, i.e. A floodplain exists with grassy areas beside the river along which a person can walk. Work of River. 8. Young River - the upper course. Furthermore, religious activities such as burials and cremations near the shore contribute towards pollution. Whitewater is rated on a scale of increasing difficulty from Class 1 to Class 6. When the river enters the plain it twists, turns and forms large bends. the river has a greater discharge than This is unsurprising as hundreds of industries nearby release their effluents into the river. Small rivers can be referred to using names such as stream, creek, brook, rivulet, and rill.There are no official definitions for the generic term river … Our Environment is the NCERT Geography book for students in Class 7. In India, the River Ganges is the sixth most polluted river in the world. Nearly all rivers have an upper, middle, and lower course. Describe the work of a river. d. Work of Wind. Correspondent Michael Safi journeys down the Yamuna river from the Himalayas, investigating how it becomes polluted as it flows through urban centers like Delhi. WORK OF THE RIVER. The Yamuna, India's most polluted river: The Guardian, July 7, 2017. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Larger rivers flow down gentle slopes and erode banks laterally. a. For NCERT Solutions for Class 7 Social Science, visit the linked article. Erosion is present though deposition of sediments also occurs. Work of Sea Waves. The beginning of a river, when it flows quickly with lots of energy, is called a young river. b. Download the worksheet by clicking on the blue … small rivers flow down steep slopes and erode river beds vertically downwards. These bends are known as meanders. The World's Dirtiest River: Unreported World/Channel 4, November 15, 2017. Question: Explain the work of a river in the lower course. Answer: Work of a River: Running water in the river erodes the landscape. River Severn | River Thames. The river becomes so slow that it begins to deposit its load. Each distributary forms its own mouth. As rivers flow from highland to lowland they perform three important jobs, they erode, they transport the material that they have eroded and then they deposit it. Some rivers, lakes, and groundwater are rendered unfit for usage. This classification system provides a useful guide to the technical difficulty of a river, but there are so many other variables that can have a huge impact on the difficulty or danger of a river. The river here is smaller and usually has a rapid, tumbling flow that cuts a narrow channel through rocky hills or mountains. Starter: Study the map of the Garonne watershed to the right.Take a copy of this map and complete a written description of the Garonne using the following sentence to get you going. Class 1 (Easy) :… Objective: To trace the Garonne river back to its source in the Pyrenees and learn about the features associated with the upper course of the river. A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. 7. Answer: As the river approaches the sea, the speed of the flowing water decreases, and the river begins to break up into a number of streams called distributaries. c. Work of Ice.
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