Answer: (a) Volcanoes are found along the weak zones of the earths crust where due to continuous tussle by tectonic forces maximum active volcanoes have created. Question 1. In the case of geyser the fissure or vent connecting the source of hot water to the surface is very narrow which greatly increases the pressure and temperature of the hot water and so when water comes out it rise high into the air. There are three main belts of volcanoes : (a) Fissure type of volcanoes : A volcano is a vent in the earths crust out of which hot molten rocks (lava) flow. (a) What is an earthquake ? (c) Volcanoes are formed by the eruption of magma from the interior and deposited on the land surface and after cooling down take the shape of volcanoes. What is the difference between dormant volcano and an extinct volcano? (b) The volcanic cone made by the quick solidification of viscous lava and having steep slopes is known as spine or plug. Fill in the blank below:______are intrusions of igneous rock that are vertical in shape. Taking the earth as a whole it has resulted in the spreading of the ocean floor at the rate of 1 cm to about 10 cm every year. Write any three destructive effects of volcanoes. Moisture, changes in temperature, frost action and winds are the main actors of mechanical weathering. The finest particles include cinder volcanic ash and dust. What are volcanoes? A well known geyser is Old Faithful in Yellow Stone National Park of Wyoming. Answer: Tectonic movements are changes through earths natural activities which are known as diastrophism. Solid Materials : The solid materials include large fragments of rocks known as volcanic bombs. Causes of Volcanic Eruption Vesuvius and Mt. Question 15. Explain briefly the landforms created by volcanoes on the surface of the earth. Give reasons for the following:The Belts of volcanic activity and earthquakes are roughly the same. 2. What causes Volcanoes? : Geography Notes UPSC IAS - iasdreamz Answer: A volcano represents some typical parts e.g. (iii) Hot springs have medicinal properties to cure skin diseases since they are a rich source of sulphur. Volcanic eruption is one of the main causes of earthquakes. The surface position immediately above the origin of an earthquake. Crater is the mouth or uppermost part of a volcano which is a big hole from which magma erupts and spreads all over. Lava from plains are very fertile. Geyser: A geyser is a fountain of hot water and superheated steam which occurs when water comes into contact with hot volcanic rocks. Plate Tectonics Most volcanic eruptions take place near plate margins. Caldera Lake A large depression at the summit of a volcano is called a caldera. These are : (b) The effects of volcanoes on human life are both positive and negative : Destructive influences :The deposition of lava makes the area very porous which creates water problem. Heated water then turns into steam spurting out to the Earths surface in the form of hot springs. Stromboli in Italy. Describe the two types of volcanoes, giving an example of each type. Volcanoes are generally caused because of the following reasons: Presence of heat and pressure in the Earth's interior: The heat and pressure increase as one move towards the interior of the Earth. Answer Weathering Question 3 The displacement of rocks by agents like wind, water or ice: Deposition Transportation Erosion Mass wasting Answer Erosion Question 4 The large-scale movement of loose materials (rock-waste) down the slope on account of gravity: Mass movement Deposition Denudation Weathering Its effect caused strange sunrise and sunset conditions. The accumulation of material around the vent gives to the volcano its typical cone-like shape known as a volcanic cone. Plate margins are zones of great volcanic activity. Earthquakes are common in the belt of young fold mountains. ICSE Solutions for Class 9 History and Civics - A Plus Topper Give two reasons why tremors occur inside the earth? It cools down as it comes into contact with atmosphere. They may spout to a height of over 150 feet. The belts of volcanic activity and earthquakes are roughly the same because the movement of magma beneath the Earth is the main cause of earthquakes and volcanoes. Among Circum Pacific Belt, . active volcanoes in Indonesia are included. ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions. Name the four major types of volcanic eruptions. Answer: There are 80% active volcanoes around the Pacific ocean which is called the Ring of Fire. The volcanoes and earthquakes are associated with each other as every volcanic activity takes place by shaking and breaking the weak crust which naturally creates tremors and earthquakes within the earths crust. The disintegration of rocks without any change in their chemical composition is known as mechanical weathering. Vesuvius in Italy is a dormant volcano because it first erupted in 79 AD. Answer: There are three types of volcanoes e.g. #ICSE #GEOGRAPHY The ICSE Board geography is basically physical geography,important for all both the students and aspirants .for text visit- https://educatio. Give reasons for the following : Filed Under: ICSE Tagged With: class 9 ICSE Solutions, geography class 9 ICSE Solutions, geography class 9 ICSE workbook Solutions, geography class 9 Solutions, geography for class 9 answers, geography for class 9 icse pdf, icse class 9 geography book pdf, icse class 9 geography notes, icse geography class 9 guide, ICSE geography class 9 Textbook Solutions, ICSE Solutions, ICSE Solutions for class 9 geography, icse syllabus for class 9 geography, ICSE Previous Year Question Papers Class 10, ICSE Specimen Paper 2021-2022 Class 10 Solved, geography class 9 ICSE workbook Solutions, ICSE geography class 9 Textbook Solutions, Concise Mathematics Class 10 ICSE Solutions, Concise Chemistry Class 10 ICSE Solutions, Concise Mathematics Class 9 ICSE Solutions, 10 Lines On National Festivals Celebration for Students and Children in English, Independence Day Slogans | Best, Inspiring, Unique and Catchy Independence Day Slogans in English, Debate on Independence Day | Indias Pride Independence Day 2021, History and Significance, 10 Lines On Importance Of Independence Day for Students and Children in English, Independence Day Essay | Essay on Independence Day for Students and Children in English, Paragraph on Independence Day 100, 150, 200, 250 to 300 Words for Kids, Students And Children, 10 Lines on Independence Day of India for Students and Children in English, Importance of Independence Day in India Essay | Essay on Importance of Independence Day in India for Students and Children in English, Independence Day Speech | Speech on Independence Day for Students and Children in English, 10 Lines on Importance of National Festivals of India for Students and Children in English, Welcome Speech for Independence Day in English for Students and Children, The forces arising from the interior of the earth are called, The molten rock that reaches the surface of the earth is called. Lava activity also provides us precious stones. For example, hot springs at Manikaran in Kullu Valley, Himachal Predesh. About six important Convection Current Cells with over-riding six large plates have been identified below the Lithosphere. In which belt most of the volcanoes of the world are found? Lapoliths : Lapoliths are saucer-shaped intrusive layer of solidified magma and sinks as shallow basins in rock-beds. If the vent is in the form of a long crack then it is knows as a Fissure Type Volcano. Volcanoes | Class-9th | ICSE Board Geography| #icse #geography Chapterwise solutions with answers as per latest marking scheme of ICSE to help students score more marks in Geography exam 2024. . One day, when you were sitting in your balcony, you suddenly noticed a volcano erupting at a distance. Thus, an earthquake may trigger a volcano and vice versa. (ii) Acidic Lava and Basic lava Acidic Lava : (iii) Cinder Cone : Volcanic cones are called Cinder cones when the material erupted consists of cinder and other solid particles. Name two types of landforms made by volcanoes. The top of the mountain was blown away by the explosion 16 metres high tidal waves were caused killing 36,000 persons in west Java. 5. The constructive effects are the creation of additional coastal plains inlets bays for good harbours creation of fissure- openings to form sulphur or hot springs etc. and the city of Herculaneum. (ii) Volcanic mountains are the most diverse mountains in the world because there are great differences in volcanic eruptions as well as materials they throw up. (b) What are the influences of volcanoes eruption on man? External processes are carried on by natural agents of change e.g. When lava solidifies in shallow basins in the shape of a saucer it is called Lopolith. Earth movements have modified the Earths surface. Indicate the world distribution of active volcanoes. Volcanic Plateaus These are derived from lava which flows from volcanic eruptions. Most of the eruptions take place along these lines of weak. Most of the recently formed volcanic areas are barren and forbidding to man. We all know that mantle has a high density than the crust. Question 33. The only active volcano in India, in Andaman and Nicobar Islands is also located in this belt. Physics. Which of the following belts of volcano is also known as the 'Ring of Fire'? The hot rocks may also eject violently in the form of solid pieces. Volcanic eruptions lead to Earthquakes. Answer: The formation of the highest mountains of Himalayas and Alps have been created by the bucking up of the geo synclines of tethys sea between Angaraland and Gondwanaland which pushed towards each other and forced the geosynclines to be lifted up forming the mountains. Question 5. Name two types of landforms made by volcanoes. Explosive volcanoes in ocean islands are followed by high Tsunami waves. a volcano that has erupted in the recent period of time. (b) Volcanic Mountains : These mountains are built from material ejected from the fissures in the earths crust. (a) The molten rocks of vulcanicity is of considerable environmental significance other than soil fertility since it is the direct or indirect cause of several classes of landforms. arranged chapter-wise and also page-wise. In certain regions the structures which were once at sea-level in the Baltic Sea are now well above the water. Explosive eruption leads to the formation of a layer of ash while lava solidifies as a sheet on the layer of ash. The lava which is poor in silica and rich in iron and magnesium. (f) Ring of Fire It is the belt around the pacific ocean where due to the weak crust 75% of active volcanoes exist forming a huge ring of fire phenomenon. It is the thinnest of all the layers. The temperature inside the Earth increases at the rate of 1 per 32 metres of descent. Question 1. Etna are located in the: are also known as Thermal Springs. Vesuvius destroyed the city of Pompeii seven times since 79 AD. Give a brief account of Plate Tectonics. Question 4. Draw a well labelled diagram showing the different parts of a volcano and the products erupted by it. VIEW SOLUTION Which volcano is known as the light house of the Mediterranean ? Give one word for the following :The surface position immediately above the origin of an earthquake. 4. Why is it called so? 1. Gases and water disappear after evaporataion. Describe important volcanic landforms on earth. Question 14. Answer: Most of the active volcanoes are formed along the fold mountains such as the Himalayas, The Alps, The Andes etc. How can volcanoes be classified on the basis of their activity? How are these classified? Solidified lava is a source of precious diamonds and minerals. Ans. Why is it so called? Question 36. The molten rock material inside the earth is known as magma. Describe the materials thrown out during volcanic eruptions. Agricultural fields are covered with layers of volcanic ash and dust making them unsuitable for cultivation. Earth Science Volcanoes Volcanoes A volcano is a landform (usually a mountain) where molten rock erupts through the surface of the planet. Their distribution shows a similar pattern. (b) What are the influences of volcanic eruptions on man ? Geography (For 2020-21 Exam) Economics (For 2021 Examination) English Paper-1. It was a thick, dark cloud that blocked out the sun. Its diameter is many times greater than that of the included vents. For example, Mauna Loa in Hawaii. It is formed by inward collapse or subsidence of a volcano. Question 6. Your Cart. Which of the following is an extinct volcano? How are these classified? What is the magma chamber of a volcano? Kilimanjaro in Africa. Chapter 8: Earthquakes | Solutions for Class 9 ICSE Total Geography
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