NCERT Solutions Class 11 Geography Chapter 4 Distribution of the Oceans and Continents have been provided below and is also available in Pdf for free download. The NCERT solutions for Class 11 Geography have been prepared as per the latest syllabus, NCERT books and examination pattern suggested in Class 11 by CBSE, NCERT and KVS. Questions given in NCERT book for Class 11 Geography are an important part of exams for Class 11 Geography and if answered properly can help you to get higher marks. Refer to more Chapter-wise answers for NCERT Class 11 Geography and also download more latest study material for all subjects. Chapter 4 Distribution of the Oceans and Continents is an important topic in Class 11, please refer to answers provided below to help you score better in exams
Chapter 4 Distribution of the Oceans and Continents Class 11 Geography NCERT Solutions
Class 11 Geography students should refer to the following NCERT questions with answers for Chapter 4 Distribution of the Oceans and Continents in Class 11. These NCERT Solutions with answers for Class 11 Geography will come in exams and help you to score good marks
Chapter 4 Distribution of the Oceans and Continents NCERT Solutions Class 11 Geography
NCERT Solution for Class 11 Geography for chapter 4 Distribution of the Oceans and Continents
1. Multiple choice question
(i) Who amongst the following was the first to consider the possibility of Europe, Africa and America having been located side by side.
(a) Alfred Wegener
(b) Antonio Pellegrini
(c) Abraham Ortelius
(d) Edmond Hess
Answer: (c) Abraham Ortelius
(ii) Polar fleeing force relates to:
(a) Revolution of the Earth
(b) Gravitation
(c) Rotation of the earth
(d) Tides
Answer: (c) Rotation of the earth
(iii) Which one of the following is not a minor plate?
(a) Nazca
(b) Arabia
(c) Philippines
(d) Antarctica
Answer: (d) Antarctica
(iv) Which one of the following facts was not considered by those while discussing the concept of sea floor spreading?
(a) Volcanic activity along the mid-oceanic ridges.
(b) Stripes of normal and reverse magnetic field observed in rocks of ocean floor.
(c) Distribution of fossils in different continents.
(d) Age of rocks from the ocean floor.
Answer: (c) Distribution of fossils in different continents.
(v) Which one of the following is the type of plate boundary of the Indian plate along the Himalayan mountains?
(a) Ocean-continent convergence
(b) Divergent boundary
(c) Transform boundary
(d) Continent-continent convergence
Answer: (d) Continent-continent convergence
2. Answer the following questions in about 30 wor
(i) What were the forces suggested by Wegener for the movement of the continents?
Answer: Wegener suggested that two forces were responsible for continental drift. These are Polar fleeing force and Tidal force. The Polar fleeing force is related to the rotation of the earth. The Tidal force is due to the attraction of the moon and the sun, which causes tides in the oceans.
(ii) How are the convectional currents in the mantle initiated and maintained?
Answer: Arthur Holmes in 1930s discussed the possibility of convection currents operating in the earth’s mantle portion, generated due to radioactive elements causing thermal differences in the mantle portion. The convectional currents in the mantle of the earth are initiated and maintained by temperature differences within the earth. Hot magma from greater depths comes up and comparatively cold lava from above goes down giving birth to convectional currents.
(iii) What is the major difference between the transform boundary and the convergent or divergent boundaries of plates?
Answer: The transform boundary is formed when two adjacent plates slip horizontally past one another. Convergent boundary is formed when two plates come closer while divergent boundary is formed when two plates move away from each other.
(iv) What was the location of the Indian landmass during the formation of the Deccan Traps?
Answer: Deccan traps were formed by volcanic lava during the movement of the Indian plate towards the Eurasian plate. This started somewhere around 60 million years ago and continued for a long period. The Indian subcontinent was still close to the equator at that time.
3. Answer the following questions in about 150 words
(i) What are the evidences in support of the continental drift theory?
Answer: Evidence of Movement of Continents:
(i) Jig-Saw-Fit: The shorelines of Africa and South America have a remarkable and unmistakable match.
(ii) Rocks of same age across the oceans: The belt of ancient rocks of 2,000 million years from Brazil coast matches with the rocks from western Africa.
(iii) Tillite: The Gondwana system of sediments from India is known to have its counter parts in Africa, Falkland Island, Madagascar, Antarctica, and Australia. At the base, the system has thick tillite indicating extensive and prolonged glaciations.
(iv) Placer Deposits: The gold bearing veins are in Brazil and it is obvious that the gold deposits of the Ghana are derived from the Brazil plateau when the two continents lay side by side.
(v) Fossils: The skeletons of Mesosaurus, a small reptile, are found only in the Southern Cape Province of South Africa and Iraver formations of Brazil. The two localities presently are 4,800 km apart with an ocean in between them.
(ii) Bring about the basic difference between the Drift theory and Plate tectonics.
Answer:
Drift Theory: German meteorologist Alfred Wegener suggested the first comprehensive theory of continental drift in 1912. According to Wegener, all the continents formed a single continental mass and mega ocean named Tethys surrounded the same. He argued that around 200 million years ago, the super continent, Pangaea, began to split into two large continental masses as Laurasia and Gondwanaland. Subsequently, Laurasia and Gondwanaland continued to break into various smaller continents that exist today. The continents assumed a shape somewhat similar to the present shape in the Pleistocene Age about 50-60 million years ago.
Plate Tectonics: In the 20th century, McKenzie, Parker, and Morgan, independently collected the available ideas and came out with a concept termed Plate Tectonics. A tectonic plate is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plates move horizontally over the earth’s asthenosphere as rigid units. The theory of plate tectonics proposes that the earth’s lithosphere is divided into major and minor plates. Young Fold Mountain ridges, trenches, and/or faults surround these major plates. Due to movements of the currents, the rigid plates of the lithosphere, which 'float' on asthenosphere, are in constant motion.
(iii) What were the major post-drift discoveries that rejuvenated the interest of scientists in the study of distribution of oceans and continents?
Answer: Several post-drift studies have revealed many new facts of geological and geographical importance. Some of the major finds are followings:
- Arthur Holmes in 1930s discussed the possibility of convection currents, which are generating due to radioactive elements causing thermal differences in the mantle portion.
- The mid-oceanic ridges were found to be most active in terms of volcanic eruptions.
- There are remarkable similarities in rocks located equidistant on either side of the crest of-ridges with respect to the period of formation, chemical compositions, and magnetic properties.
- The ocean crust rocks are much younger than the continental rocks.
- The deep trenches have deep-seated earthquake occurrences.
- The development of concept of sea floor spreading gave a new twist to the distribution of continents and oceans in form of plate tectonics.
NCERT Solutions Class 11 Geography Chapter 1 Geography as a Discipline |
NCERT Solutions Class 11 Geography Chapter 2 The Origin and Evolution of the Earth |
NCERT Solutions Class 11 Geography Chapter 3 Interior of the Earth |
NCERT Solutions Class 11 Geography Chapter 4 Distribution of the Oceans and Continents |
NCERT Solutions Class 11 Geography Chapter 5 Minerals and Rocks |
NCERT Solutions Class 11 Geography Chapter 6 Geomorphic processes |
NCERT Solutions Class 11 Geography Chapter 7 Landforms and their Evolution |
NCERT Solutions Class 11 Geography Chapter 8 Composition and Structure of Atmosphere |
NCERT Solutions Class 11 Geography Chapter 9 Solar Radiation Heat Balance and Temperature |
NCERT Solutions Class 11 Geography Chapter 10 Atmospheric circulation and weather Systems |
NCERT Solutions Class 11 Geography Chapter 11 Water in the Atmosphere |
NCERT Solutions Class 11 Geography Chapter 12 World Climate and Climate Change |
NCERT Solutions Class 11 Geography Chapter 13 Water Oceans |
NCERT Solutions Class 11 Geography Chapter 14 Movements of Ocean Water |
NCERT Solutions Class 11 Geography Chapter 15 Life on the Earth |
NCERT Solutions Class 11 Geography Chapter 16 Biodiversity and Conservation |
NCERT Solutions Class 11 Geography Chapter 1 India Location |
NCERT Solutions Class 11 Geography Chapter 2 Structure and Physiography |
NCERT Solutions Class 11 Geography Chapter 3 Drainage System |
NCERT Solutions Class 11 Geography Chapter 4 Climate |
NCERT Solutions Class 11 Geography Chapter 5 Natural Vegetation |
NCERT Solutions Class 11 Geography Chapter 6 Soils |
NCERT Solutions Class 11 Geography Chapter 7 Natural Hazards and Disasters |
NCERT Solutions Class 11 Geography Chapter 1 Introduction to Maps |
NCERT Solutions Class 11 Geography Chapter 2 Map Scale |
NCERT Solutions Class 11 Geography Chapter 3 Latitude Longitude and Time |
NCERT Solutions Class 11 Geography Chapter 4 Map Projections |
NCERT Solutions Class 11 Geography Chapter 5 Topographical Maps |
NCERT Solutions Class 11 Geography Chapter 6 Introduction to Aerial Photographs |
NCERT Solutions Class 11 Geography Chapter 7 Introduction to Remote Sensing |
NCERT Solutions Class 11 Geography Chapter 8 Weather Instruments Maps and Charts |
NCERT Solutions Class 11 Geography Chapter 4 Distribution of the Oceans and Continents
The above provided NCERT Solutions Class 11 Geography Chapter 4 Distribution of the Oceans and Continents is available on our website www.studiestoday.com for free download in Pdf. You can read the solutions to all questions given in your Class 11 Geography textbook online or you can easily download them in pdf. The answers to each question in Chapter 4 Distribution of the Oceans and Continents of Geography Class 11 has been designed based on the latest syllabus released for the current year. We have also provided detailed explanations for all difficult topics in Chapter 4 Distribution of the Oceans and Continents Class 11 chapter of Geography so that it can be easier for students to understand all answers. These solutions of Chapter 4 Distribution of the Oceans and Continents NCERT Questions given in your textbook for Class 11 Geography have been designed to help students understand the difficult topics of Geography in an easy manner. These will also help to build a strong foundation in the Geography. There is a combination of theoretical and practical questions relating to all chapters in Geography to check the overall learning of the students of Class 11.
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