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Chapters
2: Locating Places on Earth
3: Movements of the Earth
▶ 4: Structure of the Earth
5: Rocks
6: Landforms of the Earth
7: Earthquakes
8: Volcanoes
9: Weathering and Denudation
10: Hydrosphere
11: Composition and Structure of Atmosphere
12: Insolation
13: Atmospheric Pressure and Winds
14: Humidity
15: Pollution-Types and Sources
16: Effects of Pollution
17: Pollution—Preventive Measures
18: Natural Regions of the World
*: Map Based Questions
![Rachna Sapra solutions for जॉग्रफी [इंग्रजी] इयत्ता ९ आईसीएसई chapter 4 - Structure of the Earth - Shaalaa.com](/images/geography-english-class-9-icse_6:e1464ff004d844649e81e9e1e11e08a5.jpg "Rachna Sapra solutions for जॉग्रफी [इंग्रजी] इयत्ता ९ आईसीएसई chapter 4 - Structure of the Earth")
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Solutions for Chapter 4: Structure of the Earth
Below listed, you can find solutions for Chapter 4 of CISCE Rachna Sapra for जॉग्रफी [इंग्रजी] इयत्ता ९ आईसीएसई.
Rachna Sapra solutions for जॉग्रफी [इंग्रजी] इयत्ता ९ आईसीएसई 4 Structure of the Earth SOLVE AND SCORE [Pages 36 - 37]
Multiple Choice Questions (MCQs):
The radius of the earth is ______.
6,073 km
6,370 km
6,730 km
6,037 km
The deepest mining and the deepest drilling has been done upto ______ and ______.
2 km and 12 km
4 km and 10 km
4 km and 12 km
12 km and 4 km
The beds of all the five oceans are considered as part of lithosphere, while the five oceans form the earth’s realm called the hydrosphere.
Which of the following statements is the correct reason?
Animals live at the ocean bed
Plants grow at the ocean bed
Ocean bed is made up of rocks
Ocean bed is made up of SIAL
The temperature increases with increasing depth inside the earth at the rate of 1°C for ______.
165 m
32 m
32 km
165 cm
The velocity of the seismic waves ______ with the change of the medium of travel.
Increase
Decrease
Both increase and decrease
No change
Out of the three layers of the earth’s interior, which occupies the maximum volume?
Crust
Mantle
Core
All have equal volume
A few scientists compare the structure of the earth with that of an onion because of ______.
Same shape
Same composition
Concentric layered structure
None of these
The crust accounts for ______ % and mantle accounts for ______ % of the Earth’s volume.
85, 1
2.9, 5.9
1, 84
5.9, 2.9
SIMA is largely made up ______ rocks and SIAL is largely made up of ______ rocks.
Granite, Basalt
Basalt, Granite
Silica, Magnesium
Silica, Aluminium
The falling meteorites on the earth act as a source of information about the interior of the earth. Justify the above statement.
X. Meteorites are part of solar system.
Y. Meteorites have same composition as that of the earth.
X is true and Y is false
X is false and Y is true
Both X and Y are true
Both X and Y are false
The boundary between the mantle and the core is called ______.
Mohorovicic Discontinuity
Gutenberg Discontinuity
Lehmann Discontinuity
Conrad Discontinuity
Man depends upon indirect sources of information to know about the interior of the earth. Which of the following is not a reason for it?
There are number of volcanoes on the Earth
Temperature becomes very high inside the Earth
Pressure becomes very high inside the Earth.
There is no oxygen inside the Earth
The layer of the earth which supplies magma during the volcanic eruption is called ______.
Mesosphere
Asthenosphere
Barysphere
Lithosphere
The magnetic behavior of the earth is due to ______.
Crust
Mantle
Core
Asthenosphere
The diameter of the core is ______.
2,900 km
3,500 km
6,370 km
350 km
Assertion-Reason Based Questions: Four options are given for each question. Choose the correct option for your answer.
Assertion (A): The outer core is in solid state while the inner core is in liquid state.
Reason (R): The inner core records a temperature of 5,000°C.
Both A and R are true and R is the correct reason for A.
Both A and R are true but R is not the correct reason for A.
A is true and R is false.
A is false and R is true.
Assertion (A): Below the earth’s crust lies the mantle which is 2,900 km thick.
Reason (R): Mantle lies between the crust and the core.
Both A and R are true and R is the correct reason for A.
Both A and R are true but R is not the correct reason for A.
A is true and R is false.
A is false and R is true.
Assertion (A): Core is also called NIFE.
Reason (R): Core is made up of nickel and iron and has got the maximum density.
Both A and R are true and R is the correct reason for A.
Both A and R are true but R is not the correct reason for A.
A is true and R is false.
A is false and R is true.
Assertion (A): The upper part of the crust is called SIAL.
Reason (R): SIMA is a continuous layer.
Both A and R are true and R is the correct reason for A.
Both A and R are true but R is not the correct reason for A.
A is true and R is false.
A is false and R is true.
Assertion (A): The lower part of the mantle is called asthenosphere.
Reason (R): Asthenosphere supplies the magma during volcanic eruption.
Both A and R are true and R is the correct reason for A.
Both A and R are true but R is not the correct reason for A.
A is true and R is false.
A is false and R is true.
Source-based Questions:
Read the given passage and answer the following questions.
|
The innermost layer of the Earth is called the Core. It is the densest of all the layers with the density of 13 g/cu cm. It is mainly made up of the two heavy metals, namely, Iron (Ferrous) and Nickel, so it is also known as the NIFE (Ni + Fe). Its diameter is 3,500 km. and it has the temperature of about 5,000°C on an average as the temperature goes on increasing towards the centre. It is actually the same temperature as recorded on the surface of the Sun. The core is divided into two layers, the Outer Core and the Inner Core. The Outer core is in molten state due to very high temperature and the Inner core is in solid state as it gets compressed to solid state due to extremely high pressure exerted by the weight of the overlying layers of the Earth. The core is also called the Barysphere. |
- In the Inner core, the effect of hight temperature surpasses the effect of high pressure. True or False?
- Do you think the study of the core of the earth helps to trace the history of origin of the earth?
- Why is the density the highest in the core as compared to the crust or mantle?
Answer the following questions.
What is the lithosphere?
What are the three layers of the earth?
Mention the density of the crustal rocks of SIAL and SIMA.
Name the two subdivisions of the lithosphere.
Define the term Core of the Earth.
State the important features of core of the Earth.
What is SIAL?
What is SIMA?
Differentiate between SIAL and SIMA.
What do you mean by ‘discontinuity’ in context of the internal structure of the earth?
What is the significance of the Asthenosphere?
What is mesosphere?
What is the average thickness of the earth’s crust?
How does thickness of the earth’s crust change from the continent to ocean?
What do you understand by gutenberg discontinuity?
What is the composition of the core of the earth?
What is the composition of the Earth’s crust?
What is meant by the Mohorovicic Discontinuity?
Mention the rate of increase of temperature with increasing depth.
How have the meteorites helped in the study of the interior of the earth?
What is considered the most important indirect source of information about the structure of the earth?
Mention the other sources of information about the structure of the earth.
Mention the radius of the earth.
Solutions for 4: Structure of the Earth
Rachna Sapra solutions for जॉग्रफी [इंग्रजी] इयत्ता ९ आईसीएसई chapter 4 - Structure of the Earth
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