SCERT AP Board 7th Class Social Solutions 2nd Lesson Rain and Rivers Textbook Questions and Answers.
AP State Syllabus 7th Class Social Studies Solutions 2nd Lesson Rain and Rivers
7th Class Social Studies 2nd Lesson Rain and Rivers Textbook Questions and Answers
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Explain how water changes into water vapour and how clouds are formed from it.
- The story of rain begins with water vapour. When we dry our wet clothes in the open, we see that the water disappears after a while, and the clothes dry.
- Similarly, if we keep some water on a plate, it dries up in a couple of days.
- Actually, water in the cloth or in the plate becomes water vapour and mixes with the air through a process called ‘evaporation’.
- So even when water is not boiling there is evaporation.
- There are several water bodies on the earth’s surface – oceans, rivers, lakes, etc.
- There is constant evaporation of water from these water bodies.
- In fact, wherever there is moisture, like on a wet cloth, there is evaporation.
- There is evaporation from our bodies, from trees, plants and soil.
- When water vapour rises with hot air and reaches high up in the sky, it gets cooled.
- With the cooling, water vapour is transformed into tiny water droplets.
- These droplets gather around minute dust or smoke particles in the air and v gradually increase in size.
- These small drops of water gather to form the clouds.
Where do evaporation and cloud formation take place on a large scale?
- There are several water bodies on the earth’s surface – oceans, rivers lakes, etc.
- There is constant evaporation of water from these water bodies.
- Since evaporation takes place all over the earth’s surface, clouds are also being formed all over.
- However, it is on the surface of the oceans that maximum evaporation and cloud formation take place.
- After all, oceans are vast water bodies extending up to thousands of kilometres.
- As a result, it also rains very heavily on the oceans.
- Clouds travel inland for thousands of kilometres to bring rain to us.
How do the clouds reach deep inland?
Clouds travel inland for thousands of kilometres to bring rain to us. These winds come all the way from the Arabian sea and the Bay of Bengal and they transport the rainy clouds. They are called “Monsoon winds’. They are also called ‘South West Monsoon winds, as they blow from that direction. Their winds blow only in the summer.
There are two arms of the monsoon winds: One blows from the Arabian sea and the other from the Bay of Bengal.
When the South-West monsoon sets around the beginning of June the winds carrying the clouds also reach Andhra Pradesh. These winds reach the Rayalaseema districts of Chittoor and Kurnool first. However they bring very little rain as most of the moisture in the clouds falls down in rain in the Western Ghats and only dry clouds and winds, reach Rayalaseema. The mountain ranges like the Western Ghats in the path of a rain-bearing wind cause them to rise. Rising air cools down and water vapour condenses faster. Further ascent leads to rainfall.
Where does it rain maximum? Choose the right option.
A) sea coasts that are in the direction of the winds.
B) Mountains that are in the direction of the winds.
C) Lands far away from the seas.
Sea coasts that are in the direction of the winds.
Fill in the blanks choosing the correct options (bank, tributaries, flood-plain river valley)
a) A river flows through the …………… .
b) Streams or rivers joining a larger river are called the …………… of the main river.
c) The entire valley of a river which is filled with water during the floods is called the …………… of the river.
a) river valley
c) flood – plain.
The Godavari flows from the west to the east. Why?
The plain through which the rivers in Andhra Pradesh flow is high in the North – West. It slopes towards the South-East. The rivers originate in the West. Hence they naturally flow towards the South-East and finally join the Bay of Bengal.
Rivers like the Krishna and the Godavari start from the Western Ghats which receive heavy rains. The rainwater slowly percolates into the ground and flows into the river all through the year.
Describe the main stages of the water cycle. (or)
Describe the different stages of the water cycle.
Main stages of the water cycle:
Humidity: The amount of invisible water vapour present in the atmosphere is known as humidity.
Evaporation: The transformation of water from liquid to gas phases as it moves from the ground or bodies of water into the overlying atmosphere due to solar radiation.
Condensation: The transformation of Water vapour to liquid water droplets in the air, creating clouds and fog.
Precipitation: Condensed water vapour that falls to the earth’s surface.
There may be streams and rivers flowing near your village or town. Find out about them and fill in the table below.
|No.||Name||Source||Which river does it join?||Which sea does it meet?|
|1.||Krishna||Rainwater/ Western Ghats||Itself it is a river.||Bay of Bengal|
|2.||Godavari||Rainwater / W. Ghats||Itself it is a river.||Bay of Bengal|
Do the rivers in your area contain water throughout the year? Find out from elders if they had more water in earlier times.
No, the rivers in our area do not contain water throughout the year; Our elders also expressed the same.
How can people be prepared to face the disasters? (or)
What can the Government do to help the people meet the challenges of disasters like cyclones and floods?
- Cyclones and floods are seasonal phenomena. During the cyclone listen to radio or TV weather reports and in case of a cyclone/flood warning, ensure that everyone is alerted. This is usually done through loudspeakers or by going from door to door.
- Keep an emergency kit ready at home. These kits should contain important papers, some food, some money and emergency telephone numbers.
- The nearest available place where refuge could be sought in case of a cyclone
should be identified in advance.
- Wherever necessary, the walls of the house, roofing, doors and windows should be strengthened.
- When you get a cyclone warning, store adequate drinking water and food grains in waterproof bags.
- Do not venture outside, especially into the sea during and after the warning has been sounded.
- Close doors and windows and stay indoors.
- Move to a pucca building if you feel your house is not strong enough.
- If the cyclone strikes while you are in a vehicle, stop but keep away from the seashore, trees, electric poles and other objects that may be uprooted during the gale.
- If the cyclone wind suddenly drops, do not go out, as it could be the eye of the cyclone. Wait till the official all-clear declaration is made officially.
- Listen to Radio / TV for updates on the situation.
- Even after all-clear has been sounded take necessary precautions while moving to or out of your house. There may be partially uprooted trees or poles.
- Look out for snakes that may have come out of their holes. Do not enter floodwaters. They may be too deep.
- As a student group, you can play a very significant role in spreading awareness about the above precautions.
Collect the pictures showing cyclones and floods and prepare an album.
Make a poster on the devastation of the flood.
Climate change has contributed to a rise in extreme weather events. Climate change v/ill increase the frequency of heavy rainstorms/ puffing many communities at risk for devastation from floods.
As rains become heavier, streams, rivers and lakes can overflow, increasing the risk of waterborne pathogens flowing into drinking water sources. Downpours can also damage critical infrastructure.
Flooding can cause a range of health impacts and risks, including death and injury, contaminated drinking water, hazardous material spills increased populations of disease-carrying insects and rodents, mouldy houses and community disruption and displacement.
Local communities across the country can prevent floods and heavy rains from devasting their homes, buildings and agricultural land by updating the safety methods.
Observe in your village/locality where the water is being wasted, furnish the details in a table, discuss the reasons, suggest the ways how water can be saved.
|Sl. No||The place where the water is being wasted||Reason||Ways to prevent/save the water|
|1.||Near washing clothes||Negligency||Use small buckets instead of large tubes.|
|2.||While washing animals||Negligency||Use small mugs.|
|3.||While carrying water from the tank to the house.||Weight||Use small utensils instead of large ones.|