NCERT Solutions Class 11 Geography Chapter 5 Minerals And Rocks – Here are all the NCERT solutions for Class 11 Geography Chapter 5. This solution contains questions, answers, images, explanations of the complete chapter 1 titled Of Minerals And Rocks taught in Class 11. If you are a student of Class 11 who is using NCERT Textbook to study Geography, then you must come across chapter 5 Minerals And Rocks After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 11 Geography Chapter 5 Minerals And Rocks in one place.
NCERT Solutions Class 11 Geography Chapter 5 Minerals And Rocks
Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Geography for Class 11 so that you can refer them as and when required. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions.
For a better understanding of this chapter, you should also see summary of Chapter 5 Minerals And Rocks , Geography, Class 11.
|Book||Fundamentals Of Physical Geography|
Minerals And Rocks
NCERT Solutions Class 11 Geography chapter 5 Minerals And Rocks
Class 11, Geography chapter 5, Minerals And Rocks solutions are given below in PDF format. You can view them online or download PDF file for future use.
Minerals And Rocks
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Question & Answer
Q.1: Multiple choice questions. (i) Which one of the following are the two main constituents of granite? (a) Iron and nickel (b) Iron and silver (c) Silica and aluminium (d) Iron Oxide and potassium (ii) Which one of the following is the salient feature of metamorphic rocks? (a) Changeable (b) Quite (c) Crystalline (d) Foliation (iii) Which one of the following is not a single element mineral? (a) Gold (b) Silver (c) Mica (d) Graphite (iv) Which one of the following is the hardest mineral? (a) Topaz (b) Diamond (c) Quartz (d) Feldspar (v) Which one of the following is not a sedimentary rock? (a) Tillite (b) Borax (c) Breccia (d) Marble
Ans : (i) (c) Silica and aluminium (ii) (a) Changeable (iii) (c) Mica (iv) (b) Diamond (v) (d) Marble
Q.2: Answer the following questions in about 30 words. (i) What do you mean by rocks? Name the three major classes of rocks. (ii) What is an igneous rock? Describe the method of formation and characteristics of igneous rock. (iii) What is meant by sedimentary rock? Describe the mode of formation of sedimentary rock. (iv) What relationship explained by rock cycle between the major type of rock.
Ans : (i) A rock is an aggregate of one or more minerals. The earth's crust is composed of rocks. The three major classes of rocks are:
- Igneous rocks
- Sedimentary rocks
- Metamorphic rocks
- These rocks are consist of crystals.
- These rocks are extremely hard in nature.
- Fossils are not present in these rocks.
- Igneous rocks are primary rocks and other rocks (sedimentary and metamorphic) form from these primary rocks.
- Igneous rocks can be changed into sedimentary rocks or metamorphic rocks.
- The fragments derived out of igneous and metamorphic rocks form into sedimentary rocks.
- Sedimentary rock can change into metamorphic rock or into igneous rock.
- Metamorphic rock can change into igneous or sedimentary rock.
Q.3: Answer the following questions in about 150 words. (i) Define the term ‘mineral’ and name the major classes of minerals with their physical characteristics. (ii) Describe the nature and mode of origin of the chief types of rock at the earth’s crust. How will you distinguish them? (iii) What are metamorphic rocks? Describe the types of metamorphic rock and how are they formed?
Ans : (i) A mineral is a naturally occurring inorganic substance, having an orderly atomic structure and a definite chemical composition and physical properties. A mineral is composed of or more elements. But, sometimes single element minerals like sulphur, copper, silver, gold, graphite etc. are found. Major minerals with their physical properties:
- Feldspar: It has light cream to salmon pink colour. It is used in ceramics and glass making. Half of the earth's crust is composed of feldspar.
- Quartz: It consists of silica. It is a hard mineral virtually insoluble in water. It is white or colourless and used in radio and radar.
- Pyroxene : It consists of calcium, aluminium, magnesium, iron and silica. It forms 10% of the earth's crust. It is commonly found in meteorites.
- Amphibole : Its major elements are silica, aluminium, calcium and iron. They form the 7% of the earth's crust. It is used in the asbestos industry. It is black or green in colour.
- Mica : It comprises potassium, aluminium, magnesium, iron, silica etc. It forms 4% of the earth's crust. It is uses in the electrical instruments.
- Olivine : Magnesium, iron and silica are the major elements of olivine. It is used in jewellery. It is usually a greenish crystal often found in basaltic rocks.
- Igneous Rocks: These are formed when magma cools and solidifies. The process of cooling and solidification can happen in the earth's crust or on the surface of the earth.
- These are extremely hard in nature.
- Texture depends upon size and arrangement of grains or other physical conditions of the materials. If molten material is cooled slowly at great depths, mineral grains may be very large. Sudden cooling results in small and smooth grains.
- Sedimentary Rocks: Rocks (igneous, sedimentary and metamorphic) of the earth's surface are exposed to denudational agents, and are broken up into various sizes of fragments. Such fragments are transported by different exogenous agencies and deposited. These deposits through compaction turn into rocks. The deposited material is known as sediment and the rocks formed are called sedimentary rocks.
- Metamorphic Rocks: These rocks form under the action of pressure, volume and temperature (PVT) changes. Metamorphism is a process by which already consolidated rocks undergo recrystallisation and reorganisation of materials within original rocks.
- Foliated rocks: These rocks are formed in the interior of the earth under extremely high pressures that are unequal occurring when the pressure is greater in one direction than in the others. These rocks develop a platy or sheet-like structure. Slate, schist are examples.
- Non-foliated rocks: These rocks are formed around igneous intrusions where the temperatures are high but the pressures are relatively low and equal in all directions. These are not flat or elongate. Marble, quartzite are examples.
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