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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 Geography [English] Class 9 ICSE chapter 8 - Volcanoes - Shaalaa.com](/images/geography-english-class-9-icse_6:e1464ff004d844649e81e9e1e11e08a5.jpg "Rachna Sapra solutions for Geography [English] Class 9 ICSE chapter 8 - Volcanoes")
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Solutions for Chapter 8: Volcanoes
Below listed, you can find solutions for Chapter 8 of CISCE Rachna Sapra for Geography [English] Class 9 ICSE.
Rachna Sapra solutions for Geography [English] Class 9 ICSE 8 Volcanoes SOLVE AND SCORE [Pages 77 - 79]
Multiple Choice Questions (MCQs):
Which among the following is not a reason for eruption of volcanoes?
Seismic activity
Cyclones
Movement of tectonic plates
All of these
What does the term ‘fault in the crust’ mean?
Deformity
Valley
Gap in the crust
All of these
The ______ inside the crust supplies the magma for the volcanic eruption.
Crater
Vent
Laccolith
Magma chamber
Dormant volcanoes are more dangerous than active volcanoes. This is because ______.
Dormant volcanoes are more violent than active volcanoes
Dormant volcanoes cause more destruction
There is high level of uncertainty associated with dormant volcanoes
Dormant volcanoes are located in inhabited areas.
Barren island, the only active volcano of India is located in the ______.
The Himalayas
Andaman and Nicobar Islands
Lakshadweep Islands
Deccan Trap
The scientists who study volcanoes are called the ______.
Volcanologists
Volconologists
Vulcanologists
None of them
Intrusive landforms are formed inside the earth when the magma solidifies in different shapes. These are ______.
Batholith
Laccolith
Lapolith
All of these
The intrusive landform in the shape of a saucer is called ______.
Batholith
Laccolith
Lapolith
Phacolith
Which of the following is an extrusive landform?
Sill
Dyke
Cinder cone
Laccolith
Volcanoes happen to affect the groundwater as well. Which of the following is not an example of association of volcano and groundwater?
Geyser
Hot spring
Mudpool
Dyke
Extrusive landforms are formed when the lava cools down after coming out on the surface of the earth. Lava is made up ______.
Marble
Basalt
Limestone
Sandstone
Which of the following countries is known to have large number of geysers?
Greenland
Iceland
Antarctica
Ukraine
Which of the following oceans experience maximum volcanic eruptions?
Pacific
Atlantic
Arctic
Indian
Which of the following does not belong to the Alpine-Himalayan belt?
Alps
Andes
Hindukush
Vesuvius
Hot springs and geysers are rare phenomenon. However, in few countries, their hot water is used to heat up the buildings. This statement holds true for which of the following countries?
USA
New Zealand
Mexicо
South Africa
Assertion-Reason Based Questions: Four options are given for each question. Choose the correct option for your answer.
Assertion (A): Volcanoes usually erupt at the fault lines.
Reason (R): Faults provide the gap to the gases and magma to escape out.
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): Extinct volcanoes have not shown any activity for a long historic period.
Reason (R): The vent of these volcanoes have got closed with a plug.
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): Volcanoes act as natural safety valves.
Reason (R): Volcanoes help in releasing the intense pressure which builds up inside the earth.
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): Mid oceanic ridge has not shown any volcanic active in recent past.
Reason (R): Mid oceanic ridge runs through the centre of five oceans.
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): Intrusive type of landforms are built when magma cools down inside the Earth.
Reason (R): The intrusive landforms get exposed when the layer of overlying rocks gets eroded.
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.
| We have already learnt that the temperature inside the earth goes on increasing with the increasing depth. It becomes so high that it melts the rocks to form the molten magma. Being bad conductor of heat, they trap the heat and continue to melt to add to the volume of the magma. The formation of magma is accompanied with the formation of gases and steam which tend to expand and rise. The magma and gases find their escape to the earth’s surface through the weak points in the earth’s crust. These weak points are usually provided by the tectonic plate boundaries. The tectonic plates are constantly moving since they are placed on the molten magma. When the two plates diverge away from one another, they create a gap, also called the fault which provides an escape to the hot gases and magma to come out on the earth’s surface through the eruption of volcano. A volcano may also erupt when two plates converge, especially if one is continental plate and the other is an oceanic plate. The oceanic plate being denser than the continental plate subsides below the continental plate. It gets thrust into the mantle, where it may melt, form magma and then escape to the earth’s surface through the plate margin called the fault. |
- Why does the temperature inside the earth increase with increasing depth?
- Establish the correlation between hot interior of the earth and the phenomena of volcanoes.
- What role do the tectonic plate boundaries play in the phenomena of volcanoes?
- Do you think the volcanoes would have erupted if there were no plate boundaries? What would have been the consequences of that?
Answer the following questions.
Name four types of intrusive landforms.
Mention two constructive effects of the volcano.
Write any three destructive effects of volcanoes.
Name the three main volcanic regions of the world.
What is a geyser?
Name the country where the maximum number of geysers are found.
Mention the two places in India where geothermal energy is being used to produce electricity.
Define laccoliths.
What are hot springs?
What gives the typical smell to hot spring waters?
What is the difference between magma and lava?
What is the magma chamber of a volcano?
What is the difference between a fissure of volcano and crater of a volcano?
What do you mean by a cinder cone?
What is sills?
What is dykes?
Give an example of a crater lake.
Classify the volcanoes based on their frequency of eruptions.
Give one example of an active volcano.
Give an example of extinct volcano.
Give one example of a dormant volcano.
Give an example of volcanic plains.
What do you understand by composite cones?
What is a caldera?
How is caldera different from a crater?
Mention the two types of extrusive landforms made by volcanoes.
What do you understand by the term phacoliths?
What does the term batholith signify?
What is called the Pacific Ring of Fire? Why is it called so?
What is a bubbling mud pool?
Explain the formation of a volcanic plateau.
Give a geographical reason for the following:
Hot springs have medicinal properties to cure skin diseases.
Give a geographical reason for the following:
Earthquakes are closely associated with volcanic belts.
Explain the following term:
Lava
Explain the following term:
Lapolith
Explain the following term:
Caldera
Explain the following term:
Crater
Solutions for 8: Volcanoes
Rachna Sapra solutions for Geography [English] Class 9 ICSE chapter 8 - Volcanoes
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