Pelee (West Indies). Fresh magma continues to pour inside the chamber. Explain briefly the landforms created by volcanoes on the surface of the earth. Internal processes are different from external processes. Question 8. In certain regions the structures which were once at sea-level in the Baltic Sea are now well above the water. Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. (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. A dormant volcano is the one which are quiet but can erupt again in future.A dormant volcano is "sleeping," but it could awaken in the future.Mount Rainier in the United States is considered as a dormant volcano. They cause extreme destruction of forests, cities and lives in large area. Question 14. (c) Volcanic Plains : These plains are vast and smooth formed by extensive volcanic flooding from volcanic centres. Some Volcanoes erupt explosively because the vent of a volcano.may be blocked by some sticky material or rock which causes the explosion. For Example- Mauna Loa in Hawaii. Answer: The magma chamber is created by the molten magma itself by melting the surrounding rocks in the form of a huge chamber. Give reasons for the following:The Circum-Pacific Belt of volcanoes is called The Ring of Fire. Give one word for the following :The surface position immediately above the origin of an earthquake. State the products erupted by a volcano. Harmful to the natural environment: Volcanic eruption releases dust and many gases in the atmosphere. Fissure-type Volcanoes and Central Type Volcanoes, Tilted Block Mountains and Listed Block Mountains. Fill in the blank below:The molten rock that reaches the surface of the earth is called______. Constructive Influences :Volcanoes have provided some fertile lands e.g. Landslides and mudflows The eruption could trigger landslides and mudflows in the surrounding areas. These are. For example-Lake Nyos. (a) An earthquake is tremor or convulsion of the earths crust due to sudden movement of the crust. It is usually in the form of cone or dome according to the material ejected. The crater lakes serve as great source of perennial rivers. Expires 12/31. 6. What is the difference between dormant volcano and an extinct volcano ? When magma reaches the surface of the earth, it is known as lava. Labelled self-explanatory diagram of a volcano is given below: Earthquakes are closely associated with volcanic belts. Two types of landforms made by volcanoes are-, 1. How can volcanoes be classified on the basis of their activity? A volcano where magma reaches the surface through a vent or a pipe. ICSE Class - 9|| Geography || Chapter-7 Volcanoes ( volcanic eruption It contains a mixture of minerals, water vapour, sulphur and dissolved gases. This dust encircled the globe for 3 years. What is the difference between dormant volcano and an extinct volcano ? Since then, it has erupted about 7 times with the last eruption seen in 1944. Your Cart. . Lava flows the creaters and flows down the sides of the cone. Due to repeated eruptions mouth of a volcano is converted into a large depression called caldera. 2. Revision Notes for Weathering and Denudation Class 9 Geography ICSE Match the items given in Column A with the correct ones in Column B. For example- The Vesuvius volcano in Italy. It is called so because over 80% of the total number of active volcanoes are concentrated in this region. For example- Sabancaya in Peru. OR Name the important belts of volcanoes. Indicate the world distribution of active volcanoes. Question 6. Lava activity also provides us precious stones. 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. Among Circum Pacific Belt, . active volcanoes in Indonesia are included. a volcano that has erupted in the recent period of time. How the theory of plate tectonics has explained the formation of mountains like Himalaya or Alps and of the volcanic islands. Describe the distribution of volcanoes in the world.ORName the important belts of volcanoes. Answer: There are three types of volcanoes e.g. In which part of the earth is NIFE found ? (e) Name the major earthquakes of India from 1991 to 1997. What do you understand by Crater of the Volcano? Match the items given in Column A with the correct ones in Column B. Answer: There are about 500 active volcanoes. the molten rock or magma mostly lava makes the conical body of a volcano. Chapter 7: Volcanoes | Solutions for Class 9 ICSE Total Geography Answer: Most of the active volcanoes are formed along the fold mountains such as the Himalayas, The Alps, The Andes etc. According to estimated figures, there are about 40 active volcanoes in the Andes, 35 in Japan, 100 in the Philippines and 70 in Indonesia. Question 17. Loss of life and property: The eruption of volcanoes can result in huge loss of lives and property. What is the magma chamber of a volcano ? Mid-World Mountain Belt Mt. (a) Distinguish between the following pairs of terms associated with vulcanicity, (b) Distinguish between the following pairs of terms associated with crustal movement of the earth. Molten magma under great pressure has the capacity to liquefy great volume of gases. They are not likely to become active again. Lavashields are made by large amount of basic lava flows making volcanic shields with a gentle slope. Describe important volcanic landforms on earth. ICSE Class 9 Answered - TopperLearning Folding and faulting frequently go together. Get Important Questions on Volcanoes ICSE Class 9 on all the topics at TopperLearning. Lava plateau : is formed by large scale fissure eruptions covering extensive area e.g Columbia plateau in South America and Deccan plateau of India. Give any two sources to reconstruct the two great religious movementsJainism and the Buddhism. 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. Archaeological Sources: The Great Stupa at Sanchi, Samath Pillar. What are tectonic movements ? The molten matter from below adds new crust along such ridges. What caused the Cascade Range volcanoes? | SAGE - IRIS Consortium Give an example of each type. Among these are included 40 active volcanoes in Andes, over 100 in the Philippines, 70 in Indonesia and 40 in Japan. The Circum-Pacific belt of volcanoes is called as Ring of Fire. Volcano Eruption - Definition, Types and Causes - BYJU'S (iii) Geyser It is a fountain of hot water and steam that escapes when underground water comes into contact with hot volcanic rocks. Stromboli Vesuvius Mt. It is called the destructive plate movement Consequently a balance exists and the Earth as a whole does not expand. (i) Volcanic Cone The erupted fluid material being hot collects around the vent and begins to cool gradually and solidifies. Give one example each of an active volcano and a dormant volcano. Thus we find that the Earths movements have modified the Earths surface. Answer: A volcanoes erupting with plentiful lava spreading over the surface into several kilometres with huge circumference and taking a shape of shield are called as shield volcanoes. Several minerals which are found deep down come up near the surface of the earth. Central GST. A volcano is a vent or opening in the crust of the Earth, connected by a conduit to an underlying magma chamber from which molten lava, volcanic gases and steam are ejected. Water in a geyser gets heated up beyond its boiling point. Maximum CISCE ICSE Class 9 Total Geography students prefer Morning Star Textbook Solutions to score more in exams. The landforms created by volcanoes on the surface of the earth are-. When lava solidifies in shallow basins in the shape of a saucer it is called Lopolith. Volcanic Mountains These mountains are built from material ejected from the fissures of the earth's crust. Question 2. Constructive and Destructive Effects of Volcanoes. If the vent is in the form of a long crack then it is known as a Fissure Type Volcano. These cones have steep slopes because they consist of particles of large size. How are volcanoes caused? Give a geographical reason for each of the following: (i) Many volcanoes are found along plate boundaries. The four major types of landforms associated with volcanoes are: State three beneficial effects of volcanoes. The hot lava together with ash and dust destroy not only human beings but also animals as well as plant life. Revision Notes for Volcanoes Class 9 Geography ICSE For example- Columbian plateau. State two ways in which lava may come out of the earths crust giving an example of each type of these volcanic activities. Question 6. Answer: Fold mountains are called so because of the result of large- scale earth movements caused by stresses in the earth's crust. Give a brief account of Plate Tectonics. arranged chapter-wise and also page-wise. Answer: The main causes of volcanic eruptions are the following : Question 3. Hot springs are a rich source of sulphur. There are a series of islands along the east coast of Asia where many volcanoes are located. Calderas are believed to result from subsidence or collapse and may or may not be related to explosive eruptions. Question 5. Question 24. The following are the three belts of volcanic eruptions: Explain in brief, how a volcanic eruption is caused. It was a thick, dark cloud that blocked out the sun. Magnum chamber; Magma chamber; Magnum; Magma; . 1. Most of them are confined to Circum-Pacific Belt and Mid World Mountain Belt. This is known as a Cinder Cone. When this depression gets filled with water, it forms a lake known as caldera lake. It causes the pressure to build up which results in violent explosion. About six important Convection Current Cells with over-riding six large plates have been identified below the Lithosphere. Imagine that you had gone for a holiday and an extinct volcano erupted. It is called the constructive plate movement. When the earth's crust is unable to accommodate itself to the strain, it results in a sudden release of energy in the form of a sudden violent shock . Fill in the blank below:A lava ___________is made up of basic lava flows solidified away from the vent. Mt. Which of the following belts of volcano is also known as the 'Ring of Fire'? Playlist TOTAL GEOGRAPHY CLASS 9 EXPLANATIONhttps://www.youtube.com/playlist?list=PLkqqjMQhGQ9mdGYNrktLdaHhij3OLXc9g Draw a labelled self-explanatory diagram of a volcano. The Karakatoa volcanic eruption (in 1883) caused such high sea waves that Karakatoa and several other neighbouring islands were completely destroyed.
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