The expansion of universe means increase in space between the galaxies. They are called orbits. This started the evolution of the present atmosphere. | The mid-day sun is exactly overhead at least once a year on all latitudes in between the Tropic of Cancer and the Tropic of Capricorn. | June 4, 2017 August 24, 2019 rawan239 . NCERT Extracts - The Origin and Evolution of the Earth, Early Theories of the Origin of the Earth, Modem Theories of the Origin of the Universe, Copyright © 2007-2020 | Videos 3 sec, OTP has been sent to your mobile number and is valid for one hour. These formed the bases for development of galaxies. Later in 1900, Chamberlain and Moulton considered that a wandering star approached the sun. Eventually, oceans were saturated with oxygen, and 2,000 million years ago, oxygen began to flood the atmosphere. It is also called expanding universe hypothesis. However, around 2,500-3,000 million years before the present, the process of photosynthesis got evolved. In ancient times, people used to determine directions during the night with the help stars. The process through which the gases were outpoured from the interior is called degassing. The earth was mostly in a volatile state during its primordial stage. You can download Free Revision Notes - The Origin and Evolution of the Earth, Class 11, Geography | EduRev Notes pdf from EduRev by The last phase in the evolution of the earth relates to the origin and evolution of life. Earth cl 11 notes geography earth cl 11 notes geography cbse cl 9 science notes for chapter life on earth the of evolution The Origin And Evolution Of Earth Cl 11 Notes GeographyCbse Cl 12 Biology Chapter 7 Evolution Revision NotesAstr 380 Chapter 6 Life In The Universe Origin AndThe Origin And Evolution Of Earth… Read More » Goal 3 - Evolution (The Origin of Life) The Origins of Life The process of evolution involves a series of natural changes that cause species (populations of different organisms) to arise, adapt to the environment, and become extinct. Arctic Circle of \[66{{{}^{1}/{}_{2}}^{o}}\] north of the equator. This tells us that the oceans are as old as 4,000 million years. The earth has been divided into twenty-four time zones of one hour each. Ursa Major or Big Bear is one such constellation. With in 300,000 years from the Big Bang, temperature dropped to 4,500 K (Kelvin) and gave rise to atomic matter. In the second stage, the hot interior of the earth contributed to the evolution of the atmosphere. Geography is an English word It has its origin m Greek, which relates to the description of the earth. Geology is the study of the Earth. The best app for CBSE students now provides The Origin and Evolution of the Earth class 11 Notes Geography latest chapter wise notes for quick preparation of CBSE exams and school-based annual examinations. These clumps continue to grow into even denser gaseous bodies, giving rise to formation of stars. Eventually, growing nebula develops localized clumps of gas. Hence, all countries decided that the count should begin from the meridian which passed through Greenwich, where the British Royal Observatory is located. Starting from the surface to the central parts, we have layers like the crust, mantle, outer core and inner core. This started the evolution of the present atmosphere. | | EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Origin of the Universe The universe began about 14.4 billion years ago The Big Bang Theory states that, in the beginning, the universe was all in one place All of its matter and energy were squished … As it grew, some energy was converted into matter. As a result, only one side of the moon is visible to us on the earth Q Neil Armstrong was the first man to step on the surface of the moon on 21 July, 1969. The universe became transparent. Chapter 4 Notes The Origin of Life. By continuing, I agree that I am at least 13 years old and have read and agree to the. This started the evolution of the present atmosphere. . It is because here the sun does not rise much above the horizon. Lithosphere: The firm outer part of the earth, comprising of the crust and upper mantle. Light travels at a speed of 3,00,000 km/second. Evolution of the Earth. Radioisotope Dating . The whole mass became a dumb-bell-shaped body and eventually it broke. of Revision Notes - The Origin and Evolution of the Earth, Class 11, Geography | EduRev Notes for Teaching, the answers and examples explain the meaning of chapter in the best manner. The moon moves around the earth in about 27 days. In 1796, a mathematician Pierre-Simon Laplace reexamined it. The Evolution of Earth 1. Due to gradual increase in density the temperature inside has increased. The friction and collision of particles led to formation of a disk-shaped cloud and the planets were formed through the process of accretion. EVOLUTION = CHANGE; All species or organisms have originated through the process of biological evolution. If you want Revision Notes - The Origin and Evolution of the Earth, Class 11, Geography | EduRev Notes The solar winds were not all that intense to cause similar removal of gases from the Jovian planets. The rainwater falling onto the surface got collected in the depressions to give rise to oceans. Questions Bank This portion of blasted material then continued to orbit the earth and eventually formed into the present moon about 4.44 billion years ago. It includes not only the surface process which have shaped the Earth's surface, but the study of the ocean floors, and the interior of the Earth. These small-rounded objects by the process of cohesion develop into what is called planetesimals. These initial density differences gave rise to differences in gravitational forces and it caused the matter to get drawn together. Geoid means an earth-like shape. Introduction. Another imaginary line running on the globe divides it into two equal parts. Revision Notes - The Origin and Evolution of the Earth, Class 11, Geography | EduRev Notes notes for Teaching is made by best teachers who have written some of the best books of As a result, a cigar-shaped extension of material was separated from the solar surface. The solar wind was most intense nearer the sun; so, it blew off lots of gas and dust from the terrestrial planets. However, in a meeting of the International Astronomical Union, a decision was taken that Pluto like other celestial objects (2003 UB^) discovered in recent past may be called. Evolution of atmospheric oxygen content. This allowed heavier materials (like iron) to sink towards the centre of the earth and the lighter ones to move towards the surface. The universe became transparent. Therefore, if rays are always slanting and provide less heat. 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