RBSE Class 7 Social Science Important Questions Geography Chapter 2 Inside Our Earth

Rajasthan Board RBSE Class 7 Social Science Important Questions Geography Chapter 2 Inside Our Earth Important Questions and Answers. 

RBSE Class 7 Social Science Important Questions Geography Chapter 2 Inside Our Earth

Multiple Choice Questions

Question 1. 
Limestone is which type of rock:
(a) Sedimentary
(b) Igneous
(c) Metamorphic
(d) None of these
Answer:
(c) Metamorphic

Question 2. 
Earthquake waves are produced from the point called as:
(a) Epicentre 
(b) Focus
(c) Core 
(d) Mantle
Answer:
(a) Epicentre 

 

Question 3. 
The other name of erarthquake waves is:
(a) Sesmic waves.
(b) Radiation
(c) Electromagnetic waves
(d) Radio waves
Answer:
(a) Sesmic waves.

Question 4. 
The mantle is found in which state:
(a) Solid
(b) Liquid/molten
(c) Gaseous
(d) All of the above
Answer:
(a) Solid

Question 5. 
The layer which is found between lower crust and upper mantle is known as:
(a) Lithosphere 
(b) Core
(c) Hydrosphere 
(d) Biosphere 
Answer:
(a) Lithosphere 

Fill in the blanks

Question 1. 
The rocks which cools down deep inside the earth’s crust are called  .................
Answer:
Intrusive rocks

Question 2  
................. minerals are commonly produced by mineral alteration.
Answer:
clay

Question 3. 
Minerals are naturally occurring ................. substance.
Answer:
inorganic

Question 4. 
Chemical precipitation produces  ................. sedimentary rock.
Answer:
limestone

Question 5. 
29% of the earth’s surface is .................  and 71% oceans
Answer:
land.

 

True/False

Question 1. 
Lithosphere is the earth’s outer zone of rigid brittle rock.
Answer:
True.

Question 2.
7 km is a typical figure for thickness of the Basalt and Gabbro crust beneath the deep clean floors.
Answer:
True.

Question 3. 
When limestone is exposed to heat and pressure slate is formed.
Answer:
False,

Question 4. 
Clay stone is a igneous rock.
Answer:
False,

Question 5. 
The deepest mine in the world is 4 km deep.
Answer: 
True.

Match the column
 

Column A	Column B
1. Deccan plate	(a) 4 km
2. Deepest mine	(b) white marble
3. Red fort	(c) Basalt
4. Tqj mahal	(d) Latin word Ignis
5. Igneous	(e) Red sandstone

Answer:

Column A	Column B
1. Deccan plate	(c) Basalt
2. Deepest mine	(a) 4 km
3. Red fort	(e) Red sandstone
4. Tqj mahal	(b) white marble
5. Igneous	(d) Latin word Ignis

Very Short Answer Type Questions

Question 1. 
Which is the deepest layer in Earth’s interior?
Answer: 
Core is the deepest layer in Earth’s interior.

Question 2. 
Define a fossil.
Answer: 
The remains of dead plants and animals beneath the layers of rocks are called fossils.

Question 3. 
Where is the deepest-mine in the world located?
Answer: 
Deepest mine is located in South Africa and it is 4 km deep.

Question 4. 
What is the radius of the Earth?
Answer: 
6371 km.

 

Question 5. 
What is the difference between pedologist and petrologist?
Answer: 
Pedologist studies soil while petrologist. studies rocks.

Question 6. 
What are the mineral consti¬tuents of Earth’s crust?
Answer: 
It is formed largely of igneous rocks. It also contains substantial proposition of metamorphic rock and upper layer of sedimentary rock.

Question 7. 
What is weathering?
Answer: 
It is a process in which rocks disintegrate physically and are decomposed chemically because of exposure near the Earth’s surface.

Question 8. 
Define erosion.
Answer: 
Removal of weathered materials from one place to another through agents of erosions i.e., rivers, wind, sea waves etc. is called erosion.

Question 9. 
Differentiate between the mineral constituents of the continental mass and oceanic crust.
Answer: 
Continental constituents are silica and aluminium whereas oceanic crust is formed of silica and magnesium.

Question 10. 
What are Telsic and Mafic rocks?
Answer: 
Telsic rocks are silicate minerals while Mafic rocks belong to the mica group.

Short Answer Type Questions

Question 1. 
What is Earth’s crust? What are the most abundant elements in the crust?
Answer: 
The outermost layer of our planet is the Earth’s crust. This has varied rocks and minerals rangings from 8 to 40 km thick and contains the continents and the oceanic basin. The Eight most abundant elements of Earth’s crust in term of percentage by weight are: Oxygen 47%, Silicon 28%, Aluminium 8.1%, Iron 5.0%, Calcium 3.6%, Sodium 2.8%, Potassium 2.6%, Magnesium 2.1%, other 0.8%.

Question 2. 
What is the percentage share of crust, mantle and core to the main constituent of the earth’s surface?
Answer: 

1. Core 15%: Presence of liquid and solid core.
2. Mantle 84%: Dense elements magma.
3. Crust 1%: Lighter material i.e. silica and aluminium. 

Question 3. 
Define the terms minerals and rocks.
Answer: 

1. Minerals are the naturally occurring, inorganic substances that possess a definite chemical composition and characteristic atomic structure. Most minerals have a crystalline structure.
2. The earth’s crust is made up of various types of rocks. Any natural mass of mineral matter that makes up the earth’s crust is called a rock. It can be of different colour, size and text rue. There are three major types of rocks, (a) Igneous rocks
   (b) Sedimentary rocks
   (c) metamorphic rocks

 

Question 4. 
What is the importance of outer crust to us?
Answer: 
The solidified outer crust of the earth is of great importance to us .This thin crust just like the skin of an apple, forms the stage on which human life and civilisation have developed. It has the valuable soil and gives us most of our minerals. All living beings get food and elements from this layer only which makes their survival possible.

Long Answer Type Questions

Question 1. 
Elaborate the process of rock cycle.
Answer: 
One rock changes into another under certain conditions in a cyclic manner. In the cycle of rock change, rocks are exposed at the earth’s surface, and their minerals are broken free and altered to form sediments. The sediments accumulate in basins, where the layers are compressed and cemented into sedimentary rocks. Deep within the earth, the heat of heavy radioactive elements (nife) melts the persisting rocks into magma, which can move'upward into the crust to form an igneous rock that cools at or below the surface. Rocks deep in the crust are exposed to the heat and pressure, forming metamorphic rocks.