Samacheer Kalvi 8th Social Science Geography Unit 3 Book Back Answers:

Samacheer Kalvi 8th Standard New Social Science Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 8 New Syllabus 2021 to 2022 Book Back Question & Answer available for both English and Tamil Mediums. Class 8 Social Geography Book Unit 3 – Hydrologic Cycle Answers/Solutions are provided on this page. 8th Std Social Science History Book portion consists of 8 units, Geography Book portion consists of  8 units, Civics book portion consists of 7 units, and Economics book portion consists of 2 units, All Social Book Back One, and Two Mark Solutions are given below.

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Samacheer Kalvi 8th Social Science Book Back Solutions PDF:

8th Social Subject 1 Mark and 2 Mark Solutions PDF available below. Click the Download option to download the book back 1 Mark & 2 Mark questions and answers. Take the printout and use it for exam purposes. Samacheer Kalvi 8th Geography Unit 3 Answers are given below.

Geography Book Back Answers

Unit 3 – Hydrologic Cycle

I. Choose the correct answer:

1. The process in which the water moves between the oceans, atmosphere and land is called –
(a) River Cycle
(b) Hydrologic Cycle
(c) Rock Cycle
(d) Life Cycle
Answer: (b) Hydrologic Cycle

2. The percentage of fresh water on the earth is –
(a) 71
(b) 97
(c) 2.8
(d) 0.6
Answer: (c) 2.8

3. The process of changing of water from gaseous to liquid form is known as –
(a) Condensation
(b) Evaporation
(c) Sublimation
(d) Rainfall
Answer: (a) Condensation

4. Water that flows in the sub – soil or through the ground into the streams, rivers, lakes and oceans is termed as –
(a) Condensation
(b) Evaporation
(c) Transpiration
(d) Runoff
Answer: (d) Runoff

5. The evaporation of water from the leaves of plants is called –
(a) Transpiration
(b) Condensation
(c) Water vapour
(d) Precipitation
Answer: (a) Transpiration

6. Water that is good enough to drink is called –
(a) Groundwater
(b) Surface water
(c) Potable water
(d) Artesian water
Answer: (c) Potable water

II. Fill in the Blanks:

1. The degree of water vapour present in the atmosphere is known as ………………
2. There are ……………… phases in the water cycle.
3. The falling of water towards the earth surface from the atmosphere in any form is known as ………………
4. The precipitation with a rain drop size of 0.5mm in diameter is known as ………………
5. Mist is lesser denser than ………………

Answer:

1. Humidity
2. Three
3. Precipitation
4. Drizzle
5. Fog

III. Match the following:

1. Vegetation                     i.)Clouds
2. Condensation               ii.)Sleet
3. Snow and rain drops  iii) At the surface
4. Infiltration                    iv) Transpiration
Answer:

1. iv
2. i
3. ii
4. iii

IV. Choose the correct statement:

1. Evaporation refers to
I. The process in which the gaseous form of water changes into liquid form.
II. It refers to the process in which the liquid form of water changes into a gaseous form.
III. Water boils at 100°C temperature but, it actually begins to evaporate at 0°C.
IV. It is responsible for the formation of clouds.

(a) I, IV, and V are correct
(b) II only correct
(c) II and III are correct
(d) All are correct
Answer:
(c) II and III are correct

V. State whether the following statements are True or False:

1. Water boils at 212°F temperature but, it begins to evaporate at 32°F.
Answer: True

2. Mist is not the tiny droplets of water hanging in the air.
Answer: False
Correct statement:
Mist is the tiny droplets of water hanging in the air.

3. The subsurface runoff is usually referred to as interflow.
Answer: True

VI. Answer in brief:

1. Write a short note on the aquifer.
Answer:
It is an underground layer of water-bearing permeable rocks, rocks fractures or unconsolidated materials.

2. Define “hydrological cycle”.
Answer:
The hydrologic cycle is a global sun – a driven process where water is transported from oceans to the atmosphere, from the atmosphere to land, and from land back to oceans.

3. How is the dew formation takes place?
Answer:

• It is a water droplet formed by the condensation of water vapour on a relatively cold surface of an object.
• It forms when the temperature of an object drops below the dew point temperature.

4. Write a short note on the surface runoff.
Answer:
Surface Runoff:

• It is the portion of rainfall which enters the stream immediately after the rainfall.
• It occurs when the rainfall is longer, heavier, and exceeds the rate of infiltration.

VII. Give reasons:

1. Infiltration of water is low in the region of non – porous soil.
Answer:
Water entering the soil at the surface of the ground is termed as infiltration. Infiltration allows the soil temporarily to store water, the rate of infiltration is influenced by the physical characteristics of the soil, vegetative cover, moisture content of the soil, soil temperature, and rainfall intensity.

2. Freshwater is less on the earth.
Answer:
Because saltwater constitutes about 97.2% and fresh water is only about 2.8%. Out of this 2.8% about 2.2% is available as surface water and the remaining 0.6% as groundwater.

3. Snowfall is common in the polar region and mountainous regions.
Answer:

1. The precipitation in the form of a powdery mass of ice is known as snowfall.
2. Often water vapour in a cloud is converted directly into snow pieces due to the lowering of temperature.
3. It is common in the polar and high mountainous regions.

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