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Lakes And Role Of Rivers Video Lecture | Crash Course: Class 9

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FAQs on Lakes And Role Of Rivers Video Lecture - Crash Course: Class 9

1. What are lakes and what is their role in the water cycle?
Ans. Lakes are large bodies of water surrounded by land. They play a crucial role in the water cycle by acting as reservoirs that store water. Lakes receive water from rivers, streams, and precipitation. They also release water through evaporation and runoff, replenishing the water cycle.
2. How do rivers contribute to the formation of lakes?
Ans. Rivers contribute to the formation of lakes through the process of erosion and deposition. As rivers flow, they erode the land and carry sediments. When the flow of the river slows down, such as in a flat or low-lying area, the sediments settle and form a lake. Over time, the lake may grow in size as the river continues to deposit sediments.
3. Can lakes be formed without the involvement of rivers?
Ans. Yes, lakes can be formed without the involvement of rivers. There are various other natural processes and factors that can contribute to the formation of lakes. For example, lakes can form in volcanic craters, by tectonic activities such as earthquakes, or by the melting of glaciers. Additionally, human activities such as damming can also create artificial lakes.
4. Do lakes only receive water from rivers?
Ans. No, lakes receive water from various sources, not just rivers. Apart from rivers, lakes can also receive water from streams, precipitation (rain, snow), groundwater, and direct runoff from surrounding areas. The water balance of a lake depends on the inflow and outflow of water from these different sources.
5. How do lakes contribute to the ecosystem?
Ans. Lakes are vital ecosystems that support a wide range of plant and animal life. They provide habitats for various species, including fish, amphibians, birds, and aquatic plants. Lakes also serve as a source of drinking water, irrigation, and recreational activities for humans. Additionally, lakes play a role in regulating the climate by storing and releasing heat, moderating local temperatures.
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