Continental Drift & prominent evidences

The theory of continental drift was propounded by Wagner according to which all he continents formed a single continental mass called PANGEA and mega ocean PANTHALASSA surrounded it. He argued that, around 200 million years ago, the supercontinent, Pangea, began to split in two different directions. 

Pangea first broke into two large continental masses as Laurasia and Gondwanaland forming Northern and Southern components respectively. Evidences in support of the continental drift are — 

1. Matching of continents (Jig-saw-fit)— the shorelines of Africa and South America facing each other have a remarkable and unmistakable match. 

2. Rocks of same age across the oceans — The belt of ancient rocks of 2000 million years from Brazil coast matches with those from Western Africa. 

3. Evidence left by past glacial flows. 

4. Fossils Deposits — Observation that Lemurs occur in India, Madagascar and Africa led some to consider a contiguous landmass ‘Lemuria’ linking three landmasses.

Comments

Post a Comment

Popular posts from this blog

Define mantle plume and explain its role in plate tectonics

Image
Mantle plume is an up-welling of abnormally hot rock within the earth’s mantle which carries heat upward in narrow, rising columns, driven by heat exchange across the core-mantle boundary. Eventually, the rising column of hot rock reaches the base of the lithosphere, where it spreads out, forming a mushroom-shaped cap to the plume.  Geophysicist, W. Jason Morgan, developed the hypothesis of mantle plumes in 1971. The largest (and most persistent) mantle plumes are presumed to form where a large volume of mantle rock is heated at the core-mantle boundary, about 1800 miles below the surface, although smaller plumes may originate elsewhere within the mantle. Heat transferred from the plume raises the temperature in the lower lithosphere to above melting point, and forms magma chambers that feed volcanoes at the surface.  Role of Mantle Plume in Plate Tectonics :  •Mantle plumes transport primordial mantle material from below the zone of active convection; produce time-p...
Read more

TSLPRB Police Constable (Civil) Syllabus For Prelims Test

(INTERMEDIATE STANDARD) (OBJECTIVE TYPE) (200 QUESTIONS)   1. English*  2. Arithmetic  3. General Science  4. History of India, Indian culture, Indian National Movement  5. Principles of Geography, Indian Geography, Polity and Economy  6. Current events of national and international importance  7. Test of Reasoning / Mental Ability  8. Contents pertaining to the State of Telangana.  * The questions relating to English Language in the syllabus will be set in English only in the Telugu/Urdu versions of the question paper also.  Note: In case any dispute about any question or answer, the decision taken by the Subject Expert Committee shall be final. The Board does not prescribe any particular textbook or publication and is not bound by the material appearing in any book or publication.
Read more

Manipur Civil Service Combined Competitive (2010-2022) Previous Papers PDF Download

The Manipur Civil Services Combined Competitive Preliminary Examination will consist of 1 (one) paper of objective type (multiple choice questions) and carry a maximum of 300 marks in General Studies.This Examination is meant to serve as a screening test only; the marks obtained in the Preliminary Examination by the candidates who are declared qualified for admission to the Main Examination will not be counted for determining their final order of merit . Manipur Civil Service Combined Competitive (Preliminary) Exam, 2010 MCSCCE (Prelim) Examination General Studies The Combined Competitive Main Examination will consist of Written Examination and Interview/Personality Test. The Written Examination will consist of 8(eight) compulsory papers of conventional essay Manipur Civil Service Combined Competitive (Mains) Exam, 2010 MCSCCE (Main) Examination General English Essay MCSCCE (Main) Examination General Studies Pap...
Read more

Public Undertakings Committee

The Committee on Public Undertakings is a Parliamentary Committee consisting of 22 Members, fifteen of whom are elected by the Lok Sabha every year from amongst its Members according to the principle of proportional representation by means of a single transferable vote and seven Members to be nominated by Rajya Sabha for being associated with the Committee. The Chairman is appointed by the Speaker from amongst the Members of the Committee. A Minister is not eligible to become a Member of the Committee. If a Member after his election to the Committee is appointed a Minister, he ceases to be a Member of the Committee from the date of such appointment. The term of the Committee does not exceed one year.  Functions: The functions of the Committee on Public Undertakings are :-  (a) to examine the reports and accounts of Public Undertakings specified in the Fourth Schedule to the Rules of Procedure and Conduct of Business in Lok Sabha ;  (b) to examine the reports, if any, of t...
Read more

How can biotechnology improve the living standards of farmers

Image
Agricultural biotechnology or agri-tech involves the use of scientific tools and techniques, including genetic engineering, molecular markers, molecular diagnostics, vaccines, and tissue culture to modify living organisms used in agricultural fields. India has a dedicated department named Biotechnology Industry Research Assistance Council (BIRAC) under the Ministry of Science and Technology which looks after different types of genetic modification which can be helpful in farming practices. Biotechnology can help Indian farmers to combat present global and regional problems, such as global warming, erratic monsoon, and desertification, etc. by different ways and thus, increase their income.  Benefits of biotechnology to Indian farmers  • Most common problem which persists across India is of erratic monsoon. Biotechnology can be used to develop those varieties of crops which can withstand even extreme rainfall.  • Biotechnology has been successfully used to combat weed mena...
Read more

Modern Indian Literature

In almost all the Indian languages, the modern age begins with the first struggle for India’s freedom in 1857, or near that time. The impact of western civilization, the rise of political consciousness, and the change in society could be seen in what was written during that time. Contact with the western world resulted in India’s acceptance of western thought on the one hand, and rejection of it on the other, and resulted in an effort made to revive her ancient glory and Indian consciousness.  A large number of writers opted for a synthesis between Indianization and westernization, in their search for a natinal ideology. All these attitudes were combined to bring about the renaissance in 19th century India. But it was a renaissance in a country which was under foreign domination. So it was not that kind of renaissance which had spread in 14th-15th century Europe, where scientific reasoning, individual freedom and humanism were the dominant characteristics.  The Indian renaissa...
Read more

Safeguarding the Indian art heritage is the need of the moment

Image
The art and heritage of a nation is a prized possession which needs to be preserved, protected and promoted. It assumes much greater significance for a vast country like India with diverse mixture of traditions and cultures.  Following factors underline the need to preserve our art and heritage :  •It gives the people a sense of history. Manuscripts and monuments have been relied on to understand the political, economic and social aspects of earlier times.  •It highlights the concept of ‘unity in diversity’ by showcasing the harmonious co-existence of different cultures and traditions.  •It is seen as a symbol of national identity. For instance the Lion Capital of Ashoka at Sarnath was adopted as the official emblem. Invoking national symbols can also instill a sense of oneness, as was done during the freedom struggle.  •In this era of rampant industrialization, the art and culture heritage can show the way towards a symbiotic relationship between development an...
Read more

MPLADS Committee

The Committee on Members of Parliament Local Area Development Scheme (Lok Sabha), an ad hoc Committee was constituted for the first time on 22 February, 1999 by the Speaker as per provisions of Rule 254(1) of the Rules of Procedure and Conduct of Business in Lok Sabha. Initially the Committee consisted of 20 Members. Later, the membership was raised to 24. The Chairperson is appointed by the Speaker from amongst the Members of the Committee.  A Minister is not eligible to become a Member of the Committee. If a Member after his election to the Committee is appointed a Minister, he ceases to be a Member of the Committee from the date of such appointment. The term of the Committee does not exceed one year. Functions  The functions of the Committee on Members of Parliament Local Area Development are:-  (a) to monitor and review periodically the performance and problems in implementation of the MPLADS Scheme (Lok Sabha);  (b) to consider complaints of members of Lok Sabha...
Read more

Manipur Civil Services Prelims & Mains Exam (2010-2022) Previous Papers PDF Download

The Manipur Civil Services Combined Competitive Preliminary Examination will consist of 1 (one) paper of objective type (multiple choice questions) and carry a maximum of 300 marks in General Studies only, for which the syllabus is mentioned in sub-section (A) of Section-II. This Examination is meant to serve as a screening test only; the marks obtained in the Preliminary Examination by the candidates who are declared qualified for admission to the Main Examination will not be counted for determining their final order of merit Manipur Civil Service Combined Competitive (Preliminary) Exam, 2016 MCSCCE (Prelims) Exam General Studies paper   Answer Key for Preliminary Exam  ˂˂˂ The Combined Competitive Main Examination will consist of Written Examination and Interview/Personality Test. The Written Examination will consist of 8(eight) compulsory papers of conventional essay Manipur Civil Service Combined Competitive (Mains) Exam, 2016 MCSCC...
Read more

TNPSC All Previous Year Question Papers PDF Download

  Assistant Public Prosecutor Gr.II (16.06.2012) Law Paper - I Download Assistant Public Prosecutor Gr.II(16.06.2012) Law Paper - II Download Assistant Public Prosecutor Gr.II(17.06.2012) Law Paper - III Download Assistant Public Prosecutor Gr.II(17.06.2012) Law Paper - IV Download Group - I (Preliminary) General Knowledge Download Group - I (Main) General Studies - Paper - 1 Download Group - I (Main) General Studies - Paper - 2 Download Combined Sub-ordinate Service Examination - I General Knowledge with General Tamil Download Combined Sub-ordinate Service Examination - I General Knowledge with General English Download Group-IV - Differently Abled Persons General Knowledge with ...
Read more