Rocks And Soils

Samacheer Book Back Questions And Answers For Geography Standard 8 Full Book “Rocks And Soils”

I Choose the correct answer:
1. Which of the following is known as sphere of rocks?
a) Atmosphere
b) Biosphere
c) Lithosphere
d) Hydrosphere

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

3. Fossils are found in _____.
a) Sedimentary rocks
b) Igneous rocks
c) Metamorphic rocks
d) Plutonic rocks

4. The top layer of soil is called as _____.
a) organic layer or humas
b) topsoil
c) subsoil
d) bedrock

5. Ideal soil for growing cotton is _____.
a) Red soil
b) Black soil
c) Alluvial soil
d) Mountain soil

6. The major components of soil is _____.
a) Rocks
b) Minerals
c) Water
d) All the above

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

II Fill in the blanks:
1. Scientific study of rocks is called _____.
2. _____ soil is highly suitable for millets cultivation.
3. The “skin of earth” is _____.
4. _____ is the kind of metamorphic rock using which Taj Mahal was built.
5. _____ is known as the primary rocks.

Answers:
1. Petrology
2. Red
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.
2. Slate is formed from shale.
3. Red soil is formed by the process of leaching.
4. M-sand is used as alternative for natural sand in construction.
5. Volcanic mountains are covered with sedimentary rocks.

Answers:
1. True
2. True
3. False (weathering of metamorphic rocks and crystalline rocks)
4. True
5. False

IV. A Match the following:
1. Granite                      A. Bed rock
2. Soil layer                   B. Plutonic rock
3. Barren island            C. Strip farming
4. Soil conservation     D. Active Volcano

Answers:
1. B
2. A
3. D
4. C

B Match the following:
1. Basalt             A. Anthracite
2. Limestone      B. Extrusive igneous
3. Coal               C. Metamorphic rock
4. Gneiss            D. Sedimentary rock
Answers:
1. B
2. D
3. A
4. C

V Choose the incorrect statement from the following:
1. a) Igneous rocks are called the primary rocks.
b) Soil is the product of weathering of rocks.
c) Sedimentary rocks are the hardest ones.
d) Deccan plateau is the region of Igneous rocks.
Answer: Igneous rocks are hardest

2. a) Soil erosion decreases its fertility.
b) Dynamic metamorphism is caused by high temperature.
c) Soil is a renewable source.
d) Humus is a part of the top layer of soil.
Answer: Caused by high pressure

VI Consider the following statements and choose the right option from the given ones:
1) Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
a) 1 and 2 are correct and 2 explains 1
b) 1 and 2 are correct but, 2 does not explain 1
c) 1 is correct but, 2 is incorrect
d) 2 is correct but, 1 is incorrect.