Telanagana SCERT Solution Class VII (7) Social Studies Chapter 2 Rain and Rivers.
(1) Explain how water changes into water vapours and how clouds are formed from it?
Ans: – The suns heat causes the earth’s surface water to heat up and evaporate. This is called evaporation process. As the temperature is lower at the top, the steam shots slowly growing cool. The cooled water droplets mix with the dust and float in the air in the shape of clouds. This is how steam and clouds are formed from water.
(2) Where do evaporation and cloud formation take place on a large scale?
Ans: – Sunlight shines directly on the surface of river pond and sea that water is heated and evaporates and rises to the top. Evaporation is highest on the surface of water. Clouds are actually a large mass of tiny drops of liquid water. When enough vapour condenses a cloud droplet is farmed. The amount of clouds on the surface of the mountain is the highest.
(3) How do the clouds reach deep inlands?
Ans: – Clouds are blown by the wind. Oceans are vast water bodies entering up to thousands of kilometres as a result it’s also river heavily on the oceans. Clouds also travel by wind for thousands of kilometres to thing rain to us.
(4) Where does it rain the most? Choose the correct option.
Ans: – Sea coasts that are in the direction of the winds.
(5) The Godavari flows from the west is the coast. Why?
Ans: – The source of Godavari River is Mahabaleshwar of Paschimghat. The river determines its course according to the slope of the land. Moreover any water flow flows down words. As the slope of land from west to east so, Godavari flows from the west to the east.
(6) Describe the main stages of water cycle.
Ans: – The stage of the water cycle is usually rotated in several stages. First, the sun shines directly on the surface of rivers canals and seas. This causes the water to evaporate and rice to the top.
Second, the evaporating aquifers rising upwards float in the air. The water particles mix with the air and then cool down. Thirdly, these cold water particles shelter the dust particles flotation in the air. From a distance, the clouds look like gas, but that is the combined position of the target water droplets. After the small droplets of water with each other to from a large water particles. Those streams later came down to the ground in the form of rain due to gravity. The water of that rain merges into the river sea canal and rotates the water.
(7) There may be streams and rivers flowing near year village or town; Find about them fill in the table below.
Ans: –
No | Name | Source | Which river does it join | Which sea does it meat |
1 | Ganga | Gangotri Glacier | Yamuna | Bay of Bengal |
2 | Brahma Putra | Himalaya | Dihang | India Ocean |
(9.) How can the people be prepared to face the disasters?
Ans. We should be kept ready whenever there is a disaster. That will be done by some stages. We need obey the rules these are.
i) Ensure the everyone alerted. Keep watching news.
ii) Keep an emergency kit ready at home.
iii) Store important papers, drinking water and food grain in water proof bags.
iv) Don’t venture outside.
Additional Questions and Answers:
- Answer the following questions.
1.) Fill in the blanks.
a.) 71% of earth’s surface is covered by water.
b.) Water evaporates and latter it becomes condensedinto water by cooling.
c.) In Telangana state, the temperature rises higher every day between March and June .
d.) From May to Octobercyclones form in bay of Bengal.
e.) The amount of rainfall for a unit area is measured in centimetres.
f.) The process of evaporation speeds up with the increase in temperature.
g.) Cyclones and floods are a seasonal phenomenon.
Q.2. Write short answers.
1.) Tributaries.
Answer:- Smaller rivers orStreams which join a large river are called ‘tributaries’.
2.) Precipitation.
Answer:- Different forms of condensation of water vapours is known as precipitation.
3.) Humidity.
Answer:- The amount of invisible Water vapours present in the atmosphere is known as humidity.
4.) Evaporation.
Answer:- Water vapour and mixes With the air through a process called ‘evaporation’.
5.) Water bodies on earth surface.
Answer:- There are several water bodies on the Earth’s surface – oceans, rivers, lakes etc.
6.) Rain gauge.
Answer:- An instrument by which the rainfall is measured is known as ‘Rain gauge’. The amount of rainfall for a unit area is measured in centimetres.
Q.3.) Long answers.
1.) How the rainfall is formed?
Answer:- As the clouds continue to rise upwards,It gets cooler and more droplets are Formed. The droplets come together to form bigger drops. As they get heavier, it gets more and more difficult for them to remain in the air and so they begin to fall as rain drops.
2.) Explain in brief about water cycle.
Answer:- The process of Water evaporating from the seas, forming clouds in the sky, coming down as rain, flowing down the slopes on land in the form of rivers and finally joining the sea, is called the water cycle.
3.) From which direction does the wind blow during the rainy season?
Answer:- These winds come all the way from the Arabian Sea and the Bay of Bengal and they transport the rain clouds. They are called‘Monsoon winds’. They are also called ‘south- west monsoon Winds’ as they blow from that direction. These winds blow only in the summer.
4.) What happens to the water that falls on the earth?
Answer:- Some of it percolates into the Soil, some flows on the surface of the land and the rest becomes water vapour and mixes with air.
5.) What are the causes of flood?
Answer:- Floods are often caused by sudden increase in the volume of water reaching a river.
6.) Explain about vegetation.
Answer:-
a.) Vegetation cover on the land obstructs the run off rainwater and slows down the speed of its flow.
b.) It reduces the erosion of soil by rainwater
c.) Vegetation allows the water to flow slowly into the river, thus prevents sudden flooding.
7.) Explain about worst cyclone occurred.
Answer:- The worst cyclone hit theEast Coast in November 1977. When 6 m high tidal waves swept across villages in coastal area, killing 9941 people. AtLeast, 100 villages were washed away by the cyclonic storms and the ensuing floods.
Q.4.) Match the following.
1.) Cyclone a. Western ghats
2.) Rain gauge b. Bay of Bengal
3.) Rivers Krishna situated c. Amount of rainfall
Answer:- 1- b, 2- c, 3-a.
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