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एनसीईआरटी भूगोल, भारतीय अर्थव्यवस्था और भारतीय राजनीति का संकलन : यूपीएससी परीक्षा हेतु पीडीऍफ़ बुक | Compilation of NCERT Geography, Indian Economy and Indian Polity : For UPSC Exam PDF Book

एनसीईआरटी भूगोल, भारतीय अर्थव्यवस्था और भारतीय राजनीति का संकलन : यूपीएससी परीक्षा हेतु पीडीऍफ़ बुक | Compilation of NCERT Geography, Indian Economy and Indian Polity : For UPSC Exam PDF Book


Compilation-of-NCERT-Geography-Indian-Economy-and-Indian-Polity-For-UPSC-Exam-PDF-Book


Name of Book :  Compilation of NCERT Geography, Indian Economy and Indian Polity / एनसीईआरटी भूगोल, भारतीय अर्थव्यवस्था और भारतीय राजनीति का संकलन 

Hope This Compilation of NCERT Geography, Indian Economy and Indian Polity Book will Step up you to Succeed / आशा करते हैं एनसीईआरटी भूगोल, भारतीय अर्थव्यवस्था और भारतीय राजनीति का संकलन पुस्तक आपके कदम सफलता की ओर ले जायगी

Language of Book : English

Size of Ebook : 16.4 MB

Total pages in ebook : 360

Ebook Downloading Status  : Best 
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Description about eBook : The Origin and Evolution of Eartt

Early theories
Origin of the Earth
Mathematician Laplace in 1796 gave theory known as Nebular Hypothesis which considered that the planets were formed out of a cloud of material associated with a youthful sun, which was slowly rotating.
Later in 1900, Chamberlain and Moulton considered that a wandering star approached the sun. As a result, a cigar-shaped extension of material was separated from the solar surface. As the passing star moved away, the material separated from the solar surface continued to revolve around the sun and it slowly condensed into planets.
This argument was supported by Sir James Jeans and later Sir Harold Jeffrey. At a later date, the arguments considered of a companion to the sun to have been coexisting called binary theories.
Modern theories Origin of the Universe
Big Bang Theory is also called expanding universe hypothesis given by Edwin Hubble, in 1920. In the beginning, all matter forming the universe existed in one place in the form of a “tiny ball” (singular atom) with an unimaginably small volume, infinite temperature and infinite density.
At the Big Bang the “tiny ball” exploded violently which led to a huge expansion 13.7 billion years ago. The expansion continues even to the present day.
Within first three minutes from the Big Bang event, the first atom began to form. Within 300,000 years from the Big Bang, temperature dropped to 4,500 K (Kelvin) and gave rise to atomic matter. The universe became transparent.
The expansion of universe means increase in space between the galaxies. An alternative to this was Hoyle’s concept of steady state. It considered the universe to be roughly the same at any point of time. However greater evidence is available for the expansion/ big bang theory............

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