{"id":40575,"date":"2022-01-25T17:34:17","date_gmt":"2022-01-25T12:04:17","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=40575"},"modified":"2022-01-25T17:34:17","modified_gmt":"2022-01-25T12:04:17","slug":"our-changing-earth-class-7-extra-questions-geography-chapter-3","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-material\/our-changing-earth\/class-7\/extra-questions\/geography\/chapter-3\/","title":{"rendered":"Our Changing Earth Class 7 Extra Questions Geography Chapter 3"},"content":{"rendered":"<h2>Our Changing Earth Class 7 Extra Questions Social Science Geography Chapter 3<\/h2>\n<p>NCERT Extra Questions for Class 7 Social Science Geography Chapter 3 Our Changing Earth<\/p>\n<p>Prelude<\/p>\n<p>Question 1.<br \/>\nWhat are lithospheric plates?<br \/>\nAnswer:<\/p>\n<ul>\n<li>The lithosphere is broken into numerous pieces.<\/li>\n<li>These big pieces are called lithospheric plates.<\/li>\n<li>The earth\u2019s crust consists of several large and small, rigid, irregularly shaped plates\/pieces.<\/li>\n<li>The movement of these plates causes changes on the surface of the earth.<\/li>\n<\/ul>\n<p>Question 2.<br \/>\nWhy do the lithospheric plates move slowly?<br \/>\nAnswer:<br \/>\nThe lithospheric plates move slowly because of the slow movement of molten magma inside the earth in a circular manner.<\/p>\n<p>Question 3.<br \/>\nWhat are the two types of the earth\u2019s forces?<br \/>\nAnswer:<\/p>\n<ul>\n<li>The earth\u2019s movements are divided on the basis of the forces which cause them.<\/li>\n<li>The forces which act in the interior of the earth are called endogenic forces.<\/li>\n<li>The forces that work on the surface of the earth are called exogenic forces.<\/li>\n<li>Endogenic forces sometimes produce sudden movements.<\/li>\n<li>At other times they produce slow movements.<\/li>\n<li>Sudden movements are earthquakes and volcanoes.<\/li>\n<li>They cause mass destruction over the surface of the earth.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-126683\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Our-Changing-Earth-Class-7-Extra-Questions-Geography-Chapter-3-1.png\" alt=\"Our Changing Earth Class 7 Extra Questions Geography Chapter 3 - 1\" width=\"623\" height=\"444\" \/><br \/>\nQuestion 4.<br \/>\nDefine a volcano.<br \/>\nAnswer:<br \/>\nA volcano is a vent or a hole in the earth\u2019s crust through which molten material erupts suddenly.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-126684\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Our-Changing-Earth-Class-7-Extra-Questions-Geography-Chapter-3-2.png\" alt=\"Our Changing Earth Class 7 Extra Questions Geography Chapter 3 - 2\" width=\"488\" height=\"281\" \/><\/p>\n<p>Question 5.<br \/>\nWhat are earthquakes? Define focus and epicentre.<br \/>\nAnswer:<br \/>\nEarthquake<\/p>\n<ul>\n<li>When the lithosphere plates move, the surface of the earth vibrates.<\/li>\n<li>The vibrations travel all around the earth.<\/li>\n<li>These vibrations are called earthquake.<\/li>\n<\/ul>\n<p>Focus:<br \/>\nThe place or point in the crust where the movement starts is called Focus.<\/p>\n<p>Epicentre:<br \/>\nThe place or the surface above the focus is called Epicentre.<\/p>\n<ul>\n<li>Vibrations travel outwards from the epicentre as waves.<\/li>\n<li>Greatest damage occurs closest to the epicentre.<\/li>\n<li>The strength of the earthquake decreases, going away from the centre.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-126685\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Our-Changing-Earth-Class-7-Extra-Questions-Geography-Chapter-3-3.png\" alt=\"Our Changing Earth Class 7 Extra Questions Geography Chapter 3 - 3\" width=\"395\" height=\"290\" \/><\/p>\n<p>Question 6.<br \/>\nWhat are three types of earthquake waves?<br \/>\nAnswer:<br \/>\nThere are three types of earthquake waves:<\/p>\n<ul>\n<li>P waves or longitudinal.<\/li>\n<li>S waves or transverse waves.<\/li>\n<li>L waves or surface waves.<\/li>\n<\/ul>\n<p>Question 7.<br \/>\nHow can we minimise the impact of an earthquake?<br \/>\nAnswer:<\/p>\n<ul>\n<li>Earthquakes cannot be predicted.<\/li>\n<li>Their impact can certainly be minimised if we are prepared before hand.<\/li>\n<\/ul>\n<p>Question 8.<br \/>\nGive an account of some common earthquake prediction methods adopted locally by people.<br \/>\nAnswer:<br \/>\nSome of the common earthquake prediction methods adopted locally by people are:<\/p>\n<ul>\n<li>Wild animal behaviour.<\/li>\n<li>Agitated fish in the ponds.<\/li>\n<li>Snakes coming out to the surface from their holes.<\/li>\n<li>Animals trying to untie themselves and run away.<\/li>\n<li>Birds leaving their nests and beginning to chatter loudly.<\/li>\n<li>Aborigines beginning to run to higher grounds.<\/li>\n<\/ul>\n<p>Question 9.<br \/>\nWhat is seismograph? How is the magnitude of earthquake measured?<br \/>\nAnswer:<\/p>\n<ul>\n<li>An earthquake is measured with a machine.<\/li>\n<li>It is called a seismograph.<\/li>\n<\/ul>\n<p>The magnitude of the earthquake is measured on Richter scale.<\/p>\n<ul>\n<li>An earthquake of 2.0 or less is felt only a little.<\/li>\n<li>An earthquake over 5.0 causes damage from things falling.<\/li>\n<li>A 6.0 or higher magnitude is considered very strong and 7.0 is classified as a major earthquake.<\/li>\n<\/ul>\n<p>Question 10.<br \/>\nExplain Earthquake preparedness.<br \/>\nAnswer:<br \/>\nEarthquake Preparedness:<br \/>\nWhen an earthquake strikes we should do the following:<\/p>\n<ul>\n<li>We should be in a safe spot like: under a kitchen counter, table or desk.<\/li>\n<li>We should stand against an inside comer or wall.<\/li>\n<li>We should stay away from fire places, areas around chimneys, windows that shatter including mirrors and picture frames.<\/li>\n<li>We should be prepared by arousing awareness amongst our friends and family members.<\/li>\n<li>We should face any disaster confidently.<\/li>\n<\/ul>\n<p>NOTES: Case Study Bhuj Earthquake:<\/p>\n<ul>\n<li>An earthquake measuring 6.9 on richter scale hits Bhuj in Gujarat.<\/li>\n<li>Schools worst affected.<\/li>\n<li>Communication water power supply affected<\/li>\n<li>Hundreds of fire started<\/li>\n<li>Emergency declared and CM appeals for help.<\/li>\n<\/ul>\n<p>Major Land Forms<\/p>\n<p>Question 1.<br \/>\nWhat are the two processes which continuously wear away the landscape? Explain them.<br \/>\nAnswer:<br \/>\nThe Processes:<br \/>\nThe landscape is continuously worn away by two processes.<br \/>\nThey are:<\/p>\n<ul>\n<li>Weathering and erosion.<\/li>\n<li>Weathering is the breaking up of rocks on the earth\u2019s surface.<\/li>\n<li>Erosion is the wearing away of the landscape by different agents like water, wind and ice.<\/li>\n<li>The eroded material is carried away or transported by water, wind etc.<\/li>\n<li>They deposit material eventually.<\/li>\n<li>This process of erosion and deposition creates different landforms on the surface of the earth.<\/li>\n<\/ul>\n<p>Work of a River<\/p>\n<p>Question 1.<br \/>\nWhat is a waterfall? Explain with example.<br \/>\nAnswer:<br \/>\nWhen the rivers tumble at steep angle over the hard rocks of a deep steep valley it forms a waterfall.<br \/>\nFor example: Victoria waterfalls or Niagara waterfall.<\/p>\n<p>Question 2.<br \/>\nDescribe the work of a river.<br \/>\nAnswer:<br \/>\nWork of a River:<\/p>\n<ul>\n<li>Running water in the river erodes the landscape.<\/li>\n<li>When the river tumbles at steep angle over very hard rocks or down a steep valley side, it forms a waterfall.<\/li>\n<li>When the river enters the plain it twists, turns and forms large bends. These bends are known as meanders.<\/li>\n<\/ul>\n<p>Due to continuous erosion and deposition along the sides of the meander, the ends of the meander loop come closer and closer.<\/p>\n<ul>\n<li>In due course of time the meander loop cuts-off from the river and forms a cut-off lake.<\/li>\n<li>It is called an ox-bow lake.<\/li>\n<li>At times the river overflows its banks.<\/li>\n<li>This leads to the flooding of the neighbouring areas.<\/li>\n<li>The flood water deposits layers of fine soil and other material.<\/li>\n<li>They\u2019are called sediments, along its banks.<\/li>\n<li>This leads to the formation of a flat fertile land called a flood plain.<\/li>\n<li>The raised banks are called levees.<\/li>\n<\/ul>\n<p>As the river approaches the sea, the speed of the running water decreases.<\/p>\n<ul>\n<li>The river begins to break up into a number of streams. They are called distributaries.<\/li>\n<li>Now the river becomes so slow that it begins to deposit its load.<\/li>\n<li>Each distributary forms its own mouth.<\/li>\n<li>The collection of sediments from all the mouths forms a delta, the triangular shaped land mass.<\/li>\n<\/ul>\n<p>Work of Sea Waves<\/p>\n<p>Question 1.<br \/>\nWrite a note on the work of sea-waves.<br \/>\nAnswer:<br \/>\nWork of Sea Waves<\/p>\n<ul>\n<li>Erosion and deposition of the sea waves form coastal land forms.<\/li>\n<li>Sea waves continuously strike at the rocks.<\/li>\n<li>Cracks develop.<\/li>\n<li>In course of time they become larger and wider.<\/li>\n<li>Hollow like caves are formed on the rocks.<\/li>\n<li>They are called sea caves.<\/li>\n<li>As caves become bigger and bigger only the roofs of the caves remain. This leads to formation of Sea arches.<\/li>\n<li>Continuous erosion breaks the roofs and only walls are left.<\/li>\n<li>These wall-like features are called stacks.<\/li>\n<li>The steep rocky coast rising almost vertically above sea water is called sea cliff.<\/li>\n<li>The sea waves deposit sediments along the shores.<\/li>\n<li>This leads to formation of sea beaches.<\/li>\n<\/ul>\n<p>Work of Ice<\/p>\n<p>Question 1.<br \/>\nDescribe the work of ice.<br \/>\nAnswer:<br \/>\nWork of Ice:<\/p>\n<ul>\n<li>Glaciers are \u201crivers\u201d of ice.<\/li>\n<li>They too erode the landscape by bulldozing soil and stones to expose the solid rock below.<\/li>\n<li>Glaciers carve out deep hollows.<\/li>\n<li>As the ice melts they get filled up with water and become beautiful lakes in the mountains.<\/li>\n<li>The material carried by the glacier like big and small rocks, sand, silt gets deposited.<\/li>\n<li>These deport from glacial moraines.<\/li>\n<\/ul>\n<p>Work of Wind<\/p>\n<p>Question 1.<br \/>\nGive an account of the work of wind.<br \/>\nAnswer:<br \/>\nWork pi Wind:<br \/>\nAn active agent of erosion and deposition in the deserts is wind.<br \/>\nIn deserts there are numerous rocks with a shape of a mushroom.<\/p>\n<ul>\n<li>They are commonly called mushroom rocks.<\/li>\n<li>Winds erode the lower section of the rock more than the upper part.<\/li>\n<li>Such rocks have narrower base and wider top.<\/li>\n<\/ul>\n<p>When the wind blows, it lifts and transports sand from one place to another.<\/p>\n<ul>\n<li>When it stops blowing, the sand falls and gets deposited in low hill like structures.<\/li>\n<li>These are called sand dunes.<\/li>\n<\/ul>\n<p>When the grains of sand are very fine and light, the wind carries it over very long distances.<\/p>\n<ul>\n<li>When such a sand is deposited in large areas, they are called loess. Large deposits of loess are found in China.<\/li>\n<\/ul>\n<p>Objective Type Questions<\/p>\n<p>Question 1.<br \/>\nFill in the blanks with appropriate words:<br \/>\n1. Magma inside the earth moves in a \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026. motion.<br \/>\n2. A \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026 is a vent in the earth\u2019s crust through which molten material comes<br \/>\nout.<br \/>\n3. The place in the crust where the earthquake starts is called \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026..<br \/>\n4. The processes of \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.. and \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026. create different landform on the surface of earth.<br \/>\n5. Deposition of layers of fine soil along the bank of rivers forms \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<br \/>\n6. Sand deposits over larger areas are called\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<br \/>\nAnswer:<br \/>\n1. circular<br \/>\n2. volcano<br \/>\n3. epicentre<br \/>\n4. erosion, deposition<br \/>\n5. flood plains<br \/>\n6. loess,<\/p>\n<p>Question 2.<br \/>\nWrite whether the given statements are true or false:<br \/>\n1. Sudden movements like earthquake do not cause mass destruction.<br \/>\n2. Deposition is breaking up of rocks on the earth\u2019s surface.<br \/>\n3. Wearing away of the land by different agents like water, wind and ice is called erosion.<br \/>\n4. Sea caves become bigger and only the roof remains forming the sea arches.<br \/>\n5. Moraine is a depositional feature of glaciers,<br \/>\n6. River is an agent of erosion and deposition in the desert.<br \/>\nAnswer:<br \/>\n1. False<br \/>\n2. False<br \/>\n3. True<br \/>\n4. True<br \/>\n5. True<br \/>\n6. False.<\/p>\n<p>Question 3.<br \/>\nMatch the contents of Column A with that of Column B<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-126686\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Our-Changing-Earth-Class-7-Extra-Questions-Geography-Chapter-3-4.png\" alt=\"Our Changing Earth Class 7 Extra Questions Geography Chapter 3 - 4\" width=\"737\" height=\"206\" \/><br \/>\nAnswer:<br \/>\n1. (b)<br \/>\n2. (d)<br \/>\n3. (f)<br \/>\n4. (g)<br \/>\n5. (a)<br \/>\n6. (c).<\/p>\n<p>Multiple Choice Questions<\/p>\n<p>Prelude<\/p>\n<p>Question 1.<br \/>\nThe earth\u2019s crust is broken into a number of huge parts. They are called<br \/>\n(a) lithospheric plates<br \/>\n(b) metamorphic plates<br \/>\n(c) sedimentary plates<br \/>\n(d) none of these<br \/>\nAnswer:<br \/>\nlithospheric plates<\/p>\n<p>Question 2.<br \/>\nWhich one of the following forces originates in the interior of the earth?<br \/>\n(a) Exogenic forces<br \/>\n(b) Endogenic forces<br \/>\n(c) Both (a) and (b)<br \/>\n(d) None of these<br \/>\nAnswer:<br \/>\nEndogenic forces<\/p>\n<p>Question 3.<br \/>\nSudden movements in the earth are called<br \/>\n(a) earthquakes<br \/>\n(b) building mountains<br \/>\n(c) focus<br \/>\n(d) none of these<br \/>\nAnswer:<br \/>\nearthquakes<\/p>\n<p>Question 4.<br \/>\nThe place on the surface above the focus is known as<br \/>\n(a) epicentre<br \/>\n(b) focus<br \/>\n(c) forces<br \/>\n(d) lithosphere<br \/>\nAnswer:<br \/>\nepicentre<\/p>\n<p>Question 5.<br \/>\nWhat is the name of the instrument used for measuring earthquake?<br \/>\n(a) Thermometer<br \/>\n(b) Seismograph<br \/>\n(c) Weighing machine<br \/>\n(d) All of these<br \/>\nAnswer:<br \/>\n(b) Seismograph<\/p>\n<p>Question 6.<br \/>\nOn which scale is the earthquake measured?<br \/>\n(a) Plane scale<br \/>\n(b) Richter scale<br \/>\n(c) Compass<br \/>\n(f) Divider<br \/>\nAnswer:<br \/>\nRichter scale<\/p>\n<p>Major Land Forms<\/p>\n<p>Work of a River:<\/p>\n<p>Question 1.<br \/>\nIn which continent is the highest waterfall \u2018Angel Falls of Venezuela\u2019 located?<br \/>\n(a) South America<br \/>\n(b) South Africa<br \/>\n(c) South India<br \/>\n(d) North India<br \/>\nAnswer:<br \/>\nSouth America<\/p>\n<p>Question 2.<br \/>\nWhere is \u2018Niagara falls\u2019 located?<br \/>\n(\u0430) On the border between Canada and USA<br \/>\n(b) On the border between India and China<br \/>\n(c) On the border between India and Pakistan<br \/>\n(d) On the border between India and Nepal<br \/>\nAnswer:<br \/>\nOn the border between Canada and USA<\/p>\n<p>Question 3.<br \/>\nThe triangular collection of sediments at the mouth of a river forms<br \/>\n(a) beach<br \/>\n(b) delta<br \/>\n(c) arches<br \/>\n(d) glaciers<br \/>\nAnswer:<br \/>\ndelta<\/p>\n<p>Work of Sea Waves<\/p>\n<p>Question 1.<br \/>\nThe steep rocky coast rising almost vertically above the sea water is called<br \/>\n(a) sea cliff<br \/>\n(b) beach<br \/>\n(c) sea cave<br \/>\n(d) erosion<br \/>\nAnswer:<br \/>\nsea cliff<\/p>\n<p>Work of Ice<\/p>\n<p>Question 1.<br \/>\nWhich of the following is an example of a glacier<br \/>\n(a) Gangotri<br \/>\n(b) Aravali<br \/>\n(c) both of these<br \/>\n(d) none of these<br \/>\nAnswer:<br \/>\nGangotri<\/p>\n<p>Work of Wind<\/p>\n<p>Question 1.<br \/>\nDeposition of sand in a low hill like structure is known as a: \u2018<br \/>\n(a) Glacier<br \/>\n(b) Sand dimes<br \/>\n(c) Hill<br \/>\n(d) Desert<br \/>\nAnswer:<br \/>\nSand dimes<\/p>\n<h4><\/h4>\n","protected":false},"excerpt":{"rendered":"<p>Our Changing Earth Class 7 Extra Questions Social Science Geography Chapter 3 NCERT Extra Questions for Class 7 Social Science [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"Get Our Changing Earth Class 7 Extra Questions Social Science Geography Chapter 3 to infinity learn.","custom_permalink":"study-material\/our-changing-earth\/class-7\/extra-questions\/geography\/chapter-3\/"},"categories":[21],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - 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