{"id":23481,"date":"2022-06-04T10:00:00","date_gmt":"2022-06-04T04:30:00","guid":{"rendered":"https:\/\/cbselibrary.com\/?p=23481"},"modified":"2023-01-25T11:05:35","modified_gmt":"2023-01-25T05:35:35","slug":"icse-solutions-for-class-7-geography-voyage-types-of-rocks","status":"publish","type":"post","link":"https:\/\/cbselibrary.com\/icse-solutions-for-class-7-geography-voyage-types-of-rocks\/","title":{"rendered":"ICSE Solutions for Class 7 Geography Voyage &#8211; Types of Rocks"},"content":{"rendered":"<h2><span style=\"color: #00ccff;\"><strong>ICSE Solutions for Class 7 Geography Voyage &#8211; Types of Rocks<\/strong><\/span><\/h2>\n<p><a class=\"button-red\" title=\"ICSE Solutions for Class 10, 9, 8, 7 and 6\" href=\"https:\/\/cbselibrary.com\/icse-solutions\/\">ICSE Solutions<\/a><a class=\"button-blue\" title=\"Selina Concise ICSE Solutions for Class 10, 9, 8, 7 and 6\" href=\"https:\/\/cbselibrary.com\/selina-concise-icse-solutions\/\">Selina ICSE Solutions<\/a><a class=\"button-blue\" title=\"ML Aggarwal ICSE Solutions for Class 7 Maths\" href=\"https:\/\/cbselibrary.com\/ml-aggarwal-icse-solutions-for-class-7-maths\/\">ML Aggarwal Solutions<\/a><\/p>\n<p>APlusTopper.com provides step by step solutions for ICSE Solutions for Class 7 Geography Voyage. You can download the\u00a0Voyage Geography ICSE Solutions for Class 7 with Free PDF download option. Geography Voyage for Class 7 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines.<\/p>\n<p><a class=\"button-red\" title=\"ICSE Solutions for Class 7 Geography Voyage\" href=\"https:\/\/cbselibrary.com\/icse-solutions-class-7-geography-voyage\/\">ICSE Solutions Class 7 Geography <\/a><a class=\"button-blue\" title=\"ICSE Solutions for Class 7 History and Civics\" href=\"https:\/\/cbselibrary.com\/icse-solutions-class-7-history-and-civics\/\">History &amp; Civics<\/a><a class=\"button-blue\" title=\"Selina Concise Mathematics Class 7 ICSE Solutions\" href=\"https:\/\/cbselibrary.com\/selina-concise-mathematics-class-7-icse-solutions\/\">Maths<\/a><a class=\"button-blue\" title=\"Selina Concise Physics Class 7 ICSE Solutions\" href=\"https:\/\/cbselibrary.com\/selina-concise-physics-class-7-icse-solutions\/\">Physics<\/a><a class=\"button-blue\" title=\"Selina Concise Chemistry Class 7 ICSE Solutions\" href=\"https:\/\/cbselibrary.com\/selina-concise-chemistry-class-7-icse-solutions\/\">Chemistry<\/a><a class=\"button-blue\" title=\"Selina Concise Biology Class 7 ICSE Solutions\" href=\"https:\/\/cbselibrary.com\/selina-concise-biology-class-7-icse-solutions\/\">Biology<\/a><\/p>\n<p><strong>THINK AND ANSWER<\/strong><\/p>\n<p>Why is diamond clear and hard while graphite is soft ? Why is coal hard and chunky ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nCarbon atoms in diamond are bonded in a strong tetrahedron pattern making it hard and clear whereas carbon atoms in graphite are bonded in weak covalent bonds making it soft and black. Coal is a combustible sedimentary rock occurring in rock strata in layers or veins called coal beds. Because of pressure and elevated temperature the carbon becomes hard and chunky.<\/p>\n<p><strong>Discuss<\/strong><\/p>\n<p>Discuss the importance of rocks for the contruction business.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nRocks such as marble and granite are used in construction industries. They are cut into stones and are used for building houses, dams, roads, etc. Rocks also provide raw materials such as limestone and gypsum used in the manufacturing of cement.<\/p>\n<p><strong>VALUES &amp; LIFE SKILLS<\/strong><\/p>\n<p>Rocks and minerals play a very important role in our lives.<br \/>\nCan you imagine modern life without minerals ?<br \/>\nWhat problems would you face in their absence ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\n<strong>Life without rocks and minerals would be disastrous &#8211;<\/strong><br \/>\nRocks are of great value to us. Some of the main benefits of- rocks are listed below :<\/p>\n<ul>\n<li>Soil is formed when rocks gradually break up and disintegrated by mechanical and chemical processes.<\/li>\n<li>Rocks contain a great variety of minerals that yield metals such as iron, manganese, and copper, which are important raw materials for<br \/>\nmineral-based manufacturing industries.<br \/>\nWe shall face many problems if rocks and minerals get diminished.<\/li>\n<\/ul>\n<p><strong> The following problems may exist:<\/strong><\/p>\n<ol>\n<li>Human life will come to an end, as soil is essential for food production and if rocks diminished, it would lead to non\u00acavailability of soil.<\/li>\n<li>Mineral-based manufacturing industries will also come to an end.<\/li>\n<\/ol>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>EXERCISES<\/strong><\/span><\/p>\n<p>1. Granite is an example of intrusive <strong>igneous<\/strong> rocks.<br \/>\n2. A category of rock which is formed by the alteration of the parent rock due to heat and pressure is called: <strong>metamorphic rocks.<\/strong><br \/>\n3. Conglomerate is an example of<strong> sedimentary<\/strong> rocks. .<br \/>\n4. Sedimentary rocks are formed from <strong>sediments<\/strong> accumulated over long periods.<br \/>\n5. Sedimentary rock such as limestone change into <strong>marble.<\/strong><\/p>\n<p><strong>B. Write True or False. Rewrite the false statements correctly :<\/strong><\/p>\n<p><strong>1.<\/strong> Minerals are organic substances.<br \/>\n<strong>Answer.<\/strong> False.<br \/>\n<strong>Correct :<\/strong> Minerals are inorganic substances.<\/p>\n<p><strong>2.<\/strong> Basalt is an example of an intrusive igneous rock.<br \/>\n<strong>Answer.<\/strong> False.<br \/>\n<strong>Correct :<\/strong> Basalt is an example of an extrusive igneous rock.<\/p>\n<p><strong>3.<\/strong> Sedimentary rocks are formed by the cooling and solidification of molten rock called magma.<br \/>\n<strong>Answer.<\/strong> False.<br \/>\n<strong>Correct :<\/strong> Igneous rocks are formed by the cooling and solidification of molten rock called magma.<\/p>\n<p><strong>4.<\/strong> Igneous and sedimentary rocks can change into metamorphic rocks.<br \/>\n<strong>Answer.<\/strong> True.<\/p>\n<p><strong>5.<\/strong> Rocks are used in construction industries.<br \/>\n<strong>Answer.<\/strong> True.<\/p>\n<p><strong>C. Answer the following questions in brief:<\/strong><\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 1.<\/strong><\/span><br \/>\nWhat is crust ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nThe outermost layer of the Earth is the crust. Crust is the thinnest layer of the earth.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 2.<\/strong><\/span><br \/>\nDifferentiate between <strong>SIAL<\/strong> and <strong>SIMA.<\/strong><br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\n<strong>SIAL<\/strong><\/p>\n<ol>\n<li>It is the upper layer of the earth.<\/li>\n<li>it is made up of silica and aluminium.<\/li>\n<\/ol>\n<p><strong>SIMA<\/strong><\/p>\n<ol>\n<li>It is the lower layer of the earth.<\/li>\n<li>It is made up of magnesium and silica.<\/li>\n<\/ol>\n<p><span style=\"color: #eb4924;\"><strong>Question 3.<\/strong><\/span><br \/>\nState two characteristics of the mantle.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><\/p>\n<ol>\n<li>The mantle is semi-solid.<\/li>\n<li>It is rich in iron and magnesium.<\/li>\n<li>This layer is about 2,850 km wide. Its average density is between 3.5 and 5.5.<\/li>\n<\/ol>\n<p><span style=\"color: #eb4924;\"><strong>Question 4.<\/strong><\/span><br \/>\nWhat is the difference between the inner and the outer core ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\n<strong>Inner core<\/strong><\/p>\n<ol>\n<li>Inner most layer of the Earth.<\/li>\n<li>Solid ball of iron and nickel.<\/li>\n<li>Has a radius of 1220 km.<\/li>\n<\/ol>\n<p><strong>Outer core<\/strong><\/p>\n<ol>\n<li>Surrounds the inner core.<\/li>\n<li>Made of liquid iron and nickel.<\/li>\n<li>Has a radius of Approx. 2300 km.<\/li>\n<\/ol>\n<p><span style=\"color: #eb4924;\"><strong>Question 5.<\/strong><\/span><br \/>\nWhat are minerals?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nMinerals are natural inorganic substances having a crystalline form with definite physical and chemical properties. The most common minerals in the earth\u2019s crust are silica, quartz, feldspar, mica, calcite, dolomite, gypsum, etc. There are about 2,000 minerals in the earth\u2019s crust and these combine differently to form various kinds of rocks.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 6.<\/strong><\/span><br \/>\nGive an example of an intrusive igneous rock.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nInstrusive rocks, which form large crystals at some depth in the earth\u2019s crust example : granite, basalt.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 7.<\/strong><\/span><br \/>\nClassify the following rocks as igneous, sedimentary, and metamorphic: gneiss, coal, shale, granite, gypsum, marble, sandstone, basalt, limestone, schist<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nMinerals \u2014 Rocks<br \/>\nGneiss \u2014 Metamorphic<br \/>\nCoal \u2014 Sedimentary<br \/>\nShale \u2014 Sedimentary<br \/>\nGranite \u2014 Igneous<br \/>\nGypsum \u2014 Sedimentary<br \/>\nMarble \u2014 Metamorphic<br \/>\nSandstone \u2014 Sedimentary<br \/>\nBasalt \u2014 Igneous<br \/>\nLimestone \u2014 Sedimentary<br \/>\nSchist \u2014 Metamorphic<\/p>\n<p><strong>D. Answer the following questions in one or two paragraphs :<\/strong><\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 1.<\/strong><\/span><br \/>\nExplain the structure of the earth\u2019s interior ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nThe earth\u2019s interior is divided into three main layers \u2014 the crust is the outermost layer, the mantle is the intermediate layer, and the core is the innermost layer of the earth.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 2.<\/strong><\/span><br \/>\nHow are rocks different from minerals?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nMinerals are natural inorganic substances having a crystalline form with definite physical and chemical properties whereas rocks are made up of a combination of different minerals compacted together. There are about 2,000 minerals in the earth\u2019s crust and these combine differently to form various kinds of rocks.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 3.<\/strong><\/span><br \/>\nHow are igneous rocks formed?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nIgneous rocks are formed by the cooling and solidification of molten rock called magma, which lies beneath the earth\u2019s crust. These rocks are crystalline and compact. They do not occur in layers or strata nor do they contain fossils.<br \/>\nThe cooling and solidification may take place at some depth within the earth or at the surface. The molten magma that reaches the surface of the earth is called lava. Thus, there are two types of igneous rocks classified on the basis of their place of origin &#8211; intrusive rocks, which form at some depth in the earth\u2019s crust and extrusive rocks which form at or near the surface of the earth.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 4.<\/strong><\/span><br \/>\nHow do acidic igneous rocks differ from basic igneous rocks ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nIgneous rocks may also be classified as acidic or basic depending on their composition. The acidic rocks contain more than 65% silica and very low percentage of oxides. These are Arundeep\u2019s Self-Help to Voyage-7 less dense and light coloured. For example, granite. The basic rocks contain low percentage of silica and high percentage of oxides. These are dense and dark coloured. For example, basalt.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 5.<\/strong><\/span><br \/>\nHow are sedimentary rocks formed ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nSedimentary rocks are formed from sediments accumulated over long periods, usually under water on the floors of shallow seas, rivers and lakes. These rocks are non-crystalline and are found in layers or strata and contain fossils. Conglomerate, sandstone, limestone, chalk, calcite, and dolomite are example of sedimentary rocks. Sedimentary rocks are divided into various types depending on how they are formed.<\/p>\n<ol>\n<li><strong>Mechanically formed sedimentary rocks :<\/strong><br \/>\nThese rocks have been formed by the accumulation of materials derived from other rocks which have been cemented together.<br \/>\n<strong>Examples &#8211;<\/strong> conglomerate (rounded fragments), breccia (angular fragments).<\/li>\n<li><strong>Organically formed sedimentary rocks :<\/strong><br \/>\nThese rocks have been formed by the accumulation of the remains of living organisms.<br \/>\n<strong>Examples &#8211;<\/strong> calcareous rocks such as limestone and chalk.<\/li>\n<li><strong>Chemically formed sedimentary rocks:<\/strong><br \/>\nThese rocks have been commonly formed by the process of evaporation of water containing salts in solution.<br \/>\n<strong>Examples &#8211;<\/strong> rock salt, gypsum, potash, nitrates, calcite, and dolomite.<\/li>\n<\/ol>\n<p><span style=\"color: #eb4924;\"><strong>Question 6.<\/strong><\/span><br \/>\nWhat are metamorphic rocks ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nMetamorphic rocks are those rocks which are formed by the metamorphism of pre-existing rocks due to high temperature or pressure or both. Igneous and sedimentary rocks completely changes over long periods of time because of movements in the earth\u2019s crust and volcanic or mountain building activity.<br \/>\nTransformation of rocks due to high temperature is called thermal metamorphism. Alteration of parent rock due to pressure exerted on rocks from the earth\u2019s movements is called dynamic metamorphism.<\/p>\n<p><strong>E. Picture study<\/strong><\/p>\n<p>The photograph shows you a type of rock that is widely used in the construction industry.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66480\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/ICSE-Solutions-for-Class-7-Geography-Voyage-Chapter-7-Types-of-Rocks-1.png\" alt=\"ICSE Solutions for Class 7 Geography Voyage Chapter 7 Types of Rocks 1\" width=\"283\" height=\"246\" \/><\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 1.<\/strong><\/span><br \/>\nName the type of rock.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nThe type of rock is chemically formed sedimentary rock as limestone becomes marble. It is marble.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 2.<\/strong><\/span><br \/>\nHow is it formed ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nSedimentary rocks are formed from sediment accumulated over long periods, usually under water on the floors of shallow seas, rivers, and lakes. These rocks are fromed by the process of evaporation of water containing in limestone which becomes marble.<\/p>\n<p><strong>LET\u2019S DO SOMETHING<\/strong><\/p>\n<p>With the help of your teacher, collect different types of rocks such as granite, sandstone, limestone, marble, slate, graphite, etc. and prepare a chart containing information about their colour, hardness, texture, and permeability.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nDo it Yourself.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ICSE Solutions for Class 7 Geography Voyage &#8211; Types of Rocks ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions APlusTopper.com provides step by step solutions for ICSE Solutions for Class 7 Geography Voyage. You can download the\u00a0Voyage Geography ICSE Solutions for Class 7 with Free PDF download option. 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