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. For example, the Old Faithful geyser in Wyoming, USA. For example- Sabancaya in Peru. Question 6. 4. Water in a geyser gets heated up beyond its boiling point. Name the three belts where volcanoes are found. In which part of the earth is NIFE found ? This molten material magma always tries to burst out whereever it finds any crack or hole in the crust. (b) What are Volcanoes ? Earth movements have modified the Earths surface. Composite Cone : The volcanoes which start as cinder cone and grown into large volcanic hills with alternating layers of lava and ash are called Composite cones. Mt. Question 4. Fill in the blank below:A lava ___________is made up of basic lava flows solidified away from the vent. Lava plateau : is formed by large scale fissure eruptions covering extensive area e.g Columbia plateau in South America and Deccan plateau of India. It is about 35 km on the continental masses and only 5 km on the ocean floor. It is an intrusive volcanic landform which is formed when the lava solidifies between the horizontal layers of parent rocks. What is the difference between dormant volcano and an extinct volcano ? (g) Cinder Cone The volcanic cone built of small pieces and fragments of solidified lava and ash is called Cinder Cone. It is a stream of hot water issuing from the ground. Plate margins are zones of great volcanic activity. On the basis of intensity of eruption, volcanoes are of three types: Where do volcanic eruptions generally occur? What is a geyser ? lava, steam, cinderellas, stones, cinder, smoke etc. The surface water that percolates through the cracks and crevices, turns into steam due to hot rocks. Etna are located in the: are also known as Thermal Springs. Geysers and springs are formed due volcanic activity and are very useful from health point of view as they contain sulphur and other useful minerals. Learn Volcanoes & get access to important questions, mcq's, videos & revision notes of ICSE Class 9 Geography chapter at TopperLearning. ICSE Class 9 Answered - TopperLearning What do you understand by Crater of the Volcano? ICSE Solutions for Class 9 Geography - A Plus Topper (c) Caldera : In some volcanoes the summit of the volcano blows up during a violent explosion resulting in the formation of a large depression called a Caldera. Answer: Tectonic movements are changes through earths natural activities which are known as diastrophism. Give one word for the following :A narrow block elevated between two normal faults. Huge clouds are formed after the eruption of volcanoes causing heavy rains which result in floods and landslides. For example, the Old Faithful geyser in Wyoming, USA. (a) Describe the distribution of volcanoes in the world. Circum-Pacific Belt The volcanoes occur near the earthquake belts around the young fold mountains. Main It is the weak point in the earth's crust. Volcanoes eruption of Vesuvius in 79 A.D. buried and destroyed completely the two Roman towns of Pompeii and Herculaneum. It was a horrifying sight. Notes On Volcanoes - ICSE Class 9 Geography - NextGurukul (e) Epicentre : The point on the earths surface directly above the focus of earthquake is called epicentre. When water turns into steam, it gushes up to the surface. The movement of Tectonic plates cause cracks, crevices and fissures in the Earth's crust through which the magma is poured out. An abrupt circular depression formed by extrusion of volcanic material. Describe the worlds distribution of earthquakes. ICSE Rankers is a free educational platform for ICSE and ISC k-12 students. Causes of Volcanic Eruption Answer: A volcano represents some typical parts e.g. Sometimes remnants of volcanoes after erosion helps in preserving traces of old civilization. There are about 550 known active volcanoes. 9th Class Chapter No 6 - Volcanoes in Geography for ICSE Environmental damage The eruption could have long-term environmental effects, such as damage to vegetation, wildlife habitats, and ecosystems. Give one word for the following :The funnel shaped hollow at the top of a volcanic cone. Question 2. It cools down as it comes into contact with atmosphere. 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. Give one example each of an active volcano and a dormant volcano. For example-Lake Nyos. When magma reaches the surface of the earth, it is known as lava. This is known as a mud volcano. Answer: Question 26. Answer: (a) Obviously volcanoes will be found in those regions where the crust of the earth is weak because lava can easily be discharged from such places. (e) Magma is the one word of several matters erupting out of a volcano e.g. It is called the constructive plate movement. Describe world distribution of volcanoes. Along some coasts submerged forests and various human structures show that the land has not only risen but at places it has also submerged. Get solutions of Class 9: ICSE Total Geography Morning Star book 2025 Syllabus. (c) How are volcanoes formed ? (iv) Fissure type of volcanoes : A volcano is a vent in the earths crust out of which hot molten rocks (lava) flow. The molten lava solidifies as it reaches the surface of earth forming different structures. 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Answer: The main causes of volcanic eruptions are the following : Question 3. (d) An opening in the earth's crust through which lava flows. Give one word for the following :The region where there are highest number of geysers and hot springs. Question 14. The sudden flow of basic lava from an eruptive volcano may cause the total destruction of human life property and crops in the neighbouring areas. Give reasons for the following : Question 30. Get Important Questions on Volcanoes ICSE Class 9 on all the topics at TopperLearning. What is the Pacific Ring of Fire? These include volcanic plateaus volcanic mountains and volcanic plains. VIEW SOLUTION For example, Mauna Loa in Hawaii. Answer: Destructive Effects : Question 5. Lavashields are made by large amount of basic lava flows making volcanic shields with a gentle slope. Why Do Volcanoes Erupt? Movement of tectonic plates results in earthquakes and also causes cracks, crevices and fissures in the Earth's crust through which the magma is poured out. the surface of Earth is covered by liquid or frozen water. Answer: Dormant volcano can erupt at any interval but extinct volcano can never erupt again. Volcanic mountains are the most diverse because there are great differences in volcanic eruptions as well as the materials they throw up. Lapoliths : Lapoliths are saucer-shaped intrusive layer of solidified magma and sinks as shallow basins in rock-beds. Lava is molten rocks or magma coming out from the magma chamber through a vent, which is located in the middle of a volcanic mountain and connected to a pool of lava under the earth's surface. How can volcanoes be classified on the basis of their activity? Name any two intrusive landforms made by volcanic eruptions. ICSE Solutions for Class 9 History and Civics - A Plus Topper Answer: The materials thrown out of a volcano due to eruptions are of three types : Question 12. Give any two sources to reconstruct the two great religious movementsJainism and the Buddhism. Please login to post your comments. Question 14. What causes Volcanoes? : Geography Notes UPSC IAS - iasdreamz Give two of its main characteristics of Geysers. Caldera Lake A large depression at the summit of a volcano is called a caldera. Ash clouds The volcanic ash cloud could disrupt flights, causing travel chaos for tourists. VIEW SOLUTION Short Answer Questions | Q 7 What is called the Pacific Ring of Fire? What is the difference between dormant volcano and an extinct volcano? Your Cart. Dormant volcanoes These volcanoes have not erupted in recent historical period. Sometimes remnants of volcanoes after erosion help in preserving traces of old civilization. Such earthquakes occur either simultaneously with eruption or more commonly in the period preceding an eruption. Question 2. Volcanic Mountains These mountains are formed from material ejected from the fissures of the Earth's crust. It suddenly erupted in 1883. They are not likely to become active again. Mechanical Weathering It is also known as physical weathering. The hot lava together with ash and dust destroy not only human beings but also animals as well as plant life. When lava solidifies in shallow basins in the shape of a saucer it is called Lopolith. For example- The Vesuvius volcano in Italy. A narrow block elevated between two normal faults. Question 2. Question 13. Vesuvius destroyed the city of Pompeii seven times since 79 AD. and you can use Shaalaa.com to keep it handy for your exam preparation. (b) What are the influences of volcanic eruptions on man ? Distinguish between the following pairs of terms associated with vulcaniaty, (b) Distinguish between the following pair of terms associated with crustal movement of the Earth. Their distribution shows a similar pattern. Heated water then turns into steam spurting out to the Earths surface in the form of hot springs. The two causes of volcanic eruptions are-. Answer: The materials thrown out of a volcano due to eruptions are of three types : Describe any three advantages of volcanoes. Several minerals which are found deep down come up near the surface of the earth. How the theory of plate tectonics has explained the formation of mountains like Himalaya or Alps and of the volcanic islands. The temperature inside the earth's crust increases with increase in depth at the rate of 1C per 32 metres. Volcanic Plains Sometimes lava forms a very fertile plain. The crater lakes serve as great source of perennial rivers. 3. Revision Notes for Volcanoes Class 9 Geography ICSE Kilimanjaro in Africa. (d) Mud Volcanoes A volcanic cone made of the mud due to the eruption of muddy water is called a mud volcano. (f) Crater of a volcano is the mouth of volcano in its vertex in the form of a circular hole. Fill in the blank below:______are intrusions of igneous rock that are vertical in shape. Question 6. Describe the materials thrown out during volcanic eruption. The Mid-Oceanic ridges from edges of the plates. Nav Gyanoday 8 Textbook Solutions for ICSE Hindi - Class 8 (251 days - till 31-Mar-2024) 650.00. Answer: Dormant volcano can erupt at any interval but extinct volcano can never erupt again. What is called the Pacific Ring of Fire? Many minerals from the interior of the Earth come on to the surface. Vesuvius in Italy. When the volcanoes erupt they destroy life and property. How are hot springs formed ? Table of Contents What Are Volcanoes? Identify the parts of volcano which are marked as 5 & 7, Hawaiian volcanoes are the excellent examples of. Describe important volcanic landforms on earth. stromboli (North of Sicily). Describe any three advantages of volcanoes. Name two types of landforms made by volcanoes. (v) Crater and Caldera : Crater forms the summit and Caldera the enlarged mouth or the sunken crater at the centre of a volcano. Give one word for the following :The lava which is poor in silica and rich in iron and magnesium. At the same time the crust at the other edges of the plates in oceanic trenches gets destroyed. This will impact nutrient recycling . arranged chapter-wise and also page-wise. 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 Gases and water disappear after evaporataion. Crater lake in Oregon U.S.A occupies a caldera about 9 kilometre in diameter. In this article, we will learn about the definition, formation and types of volcanoes. Give an example each of conical volcano and fissure volcano. Name the largest active volcano in the world. Give two reasons why tremors occur inside the earth? Fertile soils like Black soil are made by breaking up of lava. Crater is the mouth or uppermost part of a volcano which is a big hole from which magma erupts and spreads all over. The surface position immediately above the origin of an earthquake. About 74% of. Why is volcanic activity often associated with mountain building ? What are the influences of volcanoes eruption on man?ORWhat is the importance of volcanoes?ORMention adverse and beneficial effects of volcanoes. Chapter 12 Composition and . (a) Basic type lava sheet weather into fertile soil e.g.Deccan trap soil. Volcanic Mountains These mountains are built from material ejected from the fissures of the earth's crust. Name also one useful feature of volcanicity other than soil fertility. Explain briefly the landforms created by volcanoes on the surface of the earth. Mention any two extrusive landforms caused by volcanic eruptions. Magnum chamber; Magma chamber; Magnum; Magma; . Other useful feature of volcanicity is that the precious minerals come out with the magma near the land surface e.g. Plate margins are zones of great volcanic activity because collisions of plate margins produce the magma and allow it to escape through a vent, a fissure or a crack. The four major types of volcanic eruptions are: Volcanicity is a process which involves the intrusion of magma in the Earth's crust or the extrusion of such molten material on the Earth's surface. Volcanoes - BigSlate.com Magma chamber is the source of erupting magma. When the descending oceanic plate reaches fifty miles below the surface, the rock melts into magma. It is very simple to download the ICSE Geography Class 9 notes Volcanoes if you know the right steps to download them. Fissure-type Volcanoes and Central Type Volcanoes, Tilted Block Mountains and Listed Block Mountains. Etna Mt. The Belts of volcanic activity and earthquakes are roughly the same. Other examples are South African plateau Columbian Plateau and Ethiopian plateau. Match the items given in Column A with the correct ones in Column B. Dormant volcanoes are also known as sleeping volcanoes. the molten rock or magma mostly lava makes the conical body of a volcano. (b) What are the influences of volcanoes eruption on man? (b) Crater, ash, basalt, dyke are connected with volcanic activity. which could cause earthquakes and volcanic eruptions to cease.
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