A River’s Tale Revision Notes for Better Revision and Preparation
Class 4 EVS Chapter 13 explains the features of a river and how we are polluting them. This chapter explains one of the environmental issues that pose a great danger to our civilization and the marine ecosystem. A Rivers Tale summary will give you the exact idea of how river pollution is affecting us and how we can stop it.
To understand the context of this chapter, refer to A Rivers Tale revision notes prepared by the experts of Vedantu. The concepts will be clearer as the experts have used simpler language to explain the sections perfectly.
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Access Class 4 Environmental Studies Chapter 13: A River’s Tale Notes
Summary of A River’s Tale
The impact of man's activities on a river is the subject of this chapter.
It explains how the river becomes polluted and what steps must be taken to rescue it.
The chapter also discusses the sea and why we are unable to consume seawater.
A sea is a vast body of salt water that is partially encircled by land and covers the Earth.
A river is a naturally flowing watercourse that flows towards an ocean, sea, lake, or another river, and is usually freshwater.
Points to Remember About the River
Colour of the river - water is colorless. When we look at water in a river from afar, it appears to be bluish in color.
There must be a starting point for a river. The source is the area where it all begins.
A river's source is typically a hill or a mountain.
Most rivers begin as a little stream. Several little streams eventually join to become a river.
A river must come to an end at some point.
A river's mouth is the place where it meets the water.
The river's mouth will discharge the water into the sea, oceans, or a huge lake.
The Nile River is the world's longest river.
How Does the River Get Polluted?
Water pollution is caused by a variety of human activities. Some of them are mentioned below:
Water pollution occurs when chemicals contaminate water sources, rendering the water unfit for drinking, cooking, cleaning, swimming, and other activities.
Soluble compounds are those that dissolve in water. Some of the examples are sugar and salt.
Insoluble substances are those that do not dissolve in water. Insoluble substances include things like sand and wheat.
Soluble or Insoluble – find Out?
You will need to bring a few items from home for this exercise.
The majority of these can be found in the kitchen.
5 or 6 glasses
Fill each bottle or glass halfway with water.
Ascertain that everyone has the same amount of water.
Put each of the items in the water one by one.
For instance, put haldi in the first glass, oil in the second glass, and soda in the third glass until each glass is empty.
In a bowl of water, combine all the ingredients and observe what occurs.
Fill in the table with your observations:
So, what did you notice? Place the ( ) ma ✓ in the appropriate locations.
Dissolved in Water
Did Not Dissolve in Water
Color of Water Changes
Color of Water Does Not Changes
How to Keep Rivers Clean?
People who live near the river's edge should not bathe their pets or wash their clothes in it.
The river should not be used to dispose of industrial trash or sewage.
Before releasing sewage into the river, treatment plants should be established to remove contaminants.
How is Drinking Water Get Cleaned in Our House?
Water can be disinfected by filtering and adding chlorine tablets, or by filtering and mixing chlorine tablets and adding alum.
Why We are Unable To Drink Sea Water?
All rivers eventually merge into the sea, thus if a river is polluted, the seawater will be polluted as well.
In addition, companies discharge rubbish into the water, and sewage from cities near the sea is a major cause of pollution.
Sea water is salty and contains a variety of contaminants that are unfit for human consumption.
Ships, oil leaks, and other factors contaminate seawater.
Q1. In some places, there are many fish in the river, in others, there are only a few and in some places, there are dead fish. What could be the reason for this? Discuss.
Ans: Fresh water is required by aquatic animals such as fish. Many fish would live in the water of a river that was not polluted. Similarly, in areas where factory and domestic wastes are dumped into rivers, the water becomes polluted, killing fish and aquatic plants.
Q2. If you wanted to drink some water, from which part of the river would you like to drink? Why?
Ans: I would like to drink water at the upper reaches from the beginning of the river. The water near the source of a river is pure and uncontaminated.
Importance of CBSE Class 4 EVS Chapter 13 A Rivers Tale
Chapter 13 is all about rivers feeding us with water and how we are polluting them. This chapter explains how we are dependent on the rivers. It also tells us how we exploit this water source to a considerable level.
It teaches us how the water is becoming dirty and we are continuing our harmful acts. The different actions we do every day are messing with the sanctity of the river water and affecting the animals living in it.
Class 4 EVS Chapter 13 A Rivers Tale will also explain where we get drinking water from. We will learn how the water crisis can cause serious damage to our civilization. You will also learn how the dirty rivers are flowing into the sea and causing harm to marine life.
To understand this chapter well, refer to the revision notes prepared by the experts of Vedantu. These notes will explain where we need to stop and how we can keep the rivers clean.
Benefits of Vedantu’s Class 4 EVS Chapter 13 A Rivers Tale Notes
These notes have an easy explanation of the river pollution problem we are facing. You will get a good idea of how we are making the rivers dirty. Understand the activities we do every day in the rivers and make the rivers polluted.
All the sentences in this chapter will be explained very well. You will get to know why the colour of the river changes in its course to the plains.
Solve the notes provided with the notes to test your skills. Find out where you need to work more to make your preparation better.
Download A Rivers Tale Class 4 EVS Revision Notes
Get the revision notes on free PDF versions. Use them according to your study sessions and resolve doubts on your own. Understand the concepts explained in this chapter better. Solving the notes will also guide you to formulate accurate answers to the questions and help you score more in the exams.
FAQs on A River’s Tale Class 4 Notes CBSE EVS Chapter 13 (Free PDF Download)
1. How does river water become dirty?
The rivers come down from the mountains. When they reach the plain land, sewage and human activities make the river water dirty.
2. Why does the river water change colour in the plains?
Due to the overwhelming pollution in the river due to our activities, the colour of the river water changes in the plains.
3. How can we preserve rivers and keep away pollution?
Preserving rivers becomes easier when human activities are controlled. We should stop industrial wastewater from flowing into the river. Before disposing of water in the river, we need to culture it and make it free from harmful chemicals. We should also use bio-fertilizers and stop artificial chemicals from flowing into rivers due to rain.