CBSE Class 11 Geography Chapter 2 The Origin and Evolution of the Earth Notes
Earth and the other celestial bodies in the solar system has always been a subject of fascination for all of us. People, since the early times were eager to know about the origin of Earth and the evolution of life on it. The research to find the age of Earth started long back. A large number of hypotheses were put forth by different philosophers and scientists regarding the origin of Earth.
Early theories include: Nebular Hypothesis Revised Nebular Hypothesis Planetesimal Hypothesis of Chamberlin and Moulton Tidal Hypothesis of Jeans and Jaffreys Modern theories are: Big Bang Theory Hoyle’s Concept of Steady State The distributed matter in the universe came together due to the gravitational forces and formed the galaxies. A galaxy contains a large number of stars, which are formed from the clumps of gas developed in the nebula. Please refer Class 11 Geography Chapter 2 The Origin and Evolution of the Earth Notes for more information.
CBSE Revision Notes 