Samacheer Kalvi 8th Social Science Geography Unit 1 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 1 – Rock and Soil 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.

Check Unit wise and  Samacheer Kalvi 8th Social Science Book Back Solutions Answers PDF format for Free Download. English, Tamil, Maths, Science, and Social Science Book Back Question and Answer is available in PDF. Class 8th Standard Social Book Back Answers PDF. Check Social Science – History, Geography, Civics, Economics Answers below. See below for the 8th New Syllabus Book Back guide/Answers free PDF download:

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 1 Answers are given below.

Geography Book Back Answers

Unit 1 – Rock and Soil

I. Choose the correct answer:

1. Which of the following is known as the sphere of rocks –
(a) Atmosphere
(b) Biosphere
(c) Lithosphere
(d) Hydrosphere
Answer: (c) Lithosphere

2. World soil day is observed on –
(a) 15th August
(b) 12th January
(c) 15th October
(d) 5th December
Answer: (d) 5th December

3. Fossils are found in –
(a) Sedimentary rocks
(b) Igneous rocks
(c) Metamorphic rocks
(d) Plutonic rocks
Answer: (a) Sedimentary rocks

4. The first layer of soil is called as –
(a) Regur
(b) Regolith
(c) Unweathered rock
(d) Partially weathered rock
Answer: (b) Regolith

5. Ideal soil for growing cotton is –
(a) Red soil
(b) Black soil
(c) Alluvial soil
(d) Mountain soil
Answer: (b) Black soil 

6. The major component of soil is –
(a) Rocks
(b) Gas
(C) Water
(d) Minerals
Answer: (d) Minerals

7. Which one of the following is the most widespread most and productive category of soil –
(a) Alluvial soil
(b) Black soil
(c) Red soil
(d) Mountain soil
Answer: (a) Alluvial soil

II. Fill in the Blanks:

1. The scientific study of rocks is called ………………
2. …………… soil is highly suitable for cotton cultivation.
3. The “skin of the earth” is ……………..
4. ……………. is the kind of metamorphic rock using which the Taj Mahal was built.
5. ……………. is known as the primary rocks.

Answer:

1. Petrology
2. Black
3. Soil
4. White Marble
5. Igneous rock

III. State whether the following statements are true or false

1. Igneous rocks are called primary rocks.
Answer: True

2. Slate is formed from shale.
Answer: True

3. Red soil is formed by the process of leaching.
Answer: False
Correct statement:
Laterites soils is formed by the process of leaching.

4. M – sand is used as an alternative for natural sand in construction.
Answer: True

5. Volcanic mountains are covered with sedimentary rocks.
Answer: False
Correct statement:
Sedimentary rocks are formed from broken pieces of rocks.

IV. Match the following

Question 1.
A. Granite                      1. Bed rock
B. Soil layer                   2. Plutonic rock
C. Barren island           3. Strip farming
D. Soil conservation   4. Active Volcano

Answer:

a. 2
b. 1
c.  4
d. 3.

Question 2.
A. Basalt               1. Anthracite
B. Limestone       2. Extrusive igneous
C. Coal                  3. Metamorphic rock
D. Gneiss             4. Sedimentary rock

Answer:

a. 2
b. 4
c.  1
d.  3.

V. Choose the incorrect statement from the following:

Question 1.

1. Igneous rocks are called the primary rocks.
2. Soil is the product of the weathering of rocks.
3. Sedimentary rocks are the hardest ones.
4. Deccan plateau is the region of Igneous rocks.

Answer:
3. Sedimentary rocks are the hardest ones.

Question 2.

1. Soil erosion decreases its fertility.
2. Dynamic metamorphism is caused by high temperature.
3. Soil is a renewable source.
4. Humus is a part of the top layer of soil.

Answer:
2. Dynamic metamorphism is caused by high temperature.

VI. Consider the following statements and choose the right option from the given ones

Statement (1) – Sedimentary rocks consist of many layers.
Statement (2) – Sedimentary rocks are formed by the sediments deposited at different points in time.

1. 1 and 2 are correct and 2 explains 1
2. 1 and 2 are correct but, 2 does not explain 1
3. 1 is correct but, 2 is incorrect
4. 2 is correct but, 1 is incorrect.

Answer:
1. 1 and 2 are correct and 2 explains 1

VII. Give reasons for the following 

1. Chemical sedimentary rocks are found in the beds of reservoirs.
Answer:

• Because these are formed by the precipitation of minerals from water.
• It is formed usually through evaporation of chemical-rich solutions.

2. Igneous rocks are found in the regions of volcanoes.
Answer:
The igneous rocks are formed by the solidification of molten magma.

VIII. Distinguish the following

1. Metamorphic rock and sedimentary rock.
Answer:
Metamorphic Rocks:

• Formed when Igneous and Sedimentary rocks are subjected to high temperature and pressure.
• Mostly crystalline in nature
• Fossils do not survive in these rocks
• Example Gneiss, Slate, quartz

Sedimentary Rocks:

• Formed by the sediments derived and deposited by various agents.
• They are non – crystalline rocks
• Contain fossils., Example Coal, Oil, natural gas
• Example Chalk, Sandstone, Rock Salt

2. Soil conservation and Soil erosion.
Answer:

Soil conservation:

• The process of protecting the soil from erosion to maintain its fertility.
• Methods of soil conservation are afforestation, controlled grazing, construction of dams, crop rotation etc.,

Soil erosion:

• Removal or destruction of the top layer of soil by natural forces and human activities.
• Running water and wind are the major agents of Soil erosion.
  Rill erosion and Gully erosion are the major types of soil erosion

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