This document is highly rated by Teaching students and has been viewed 16920 times. | Notes MODULE - 1 Environment through Ages Origin of Earth and Evoluation of the Environment 1 ORIGIN OF EARTH AND EVOLUTION OF THE ENVIRONMENT We live on a beautiful planet called earth, along with a wide variety of plants, animals and other or ganisms. | The age of Earth is approximately one-third of the age of the universe. Cooling of the earth also condensed water vapour into liquid water filling the depressions to form seas. A Human-made Satellite is an artificial body. The following are considered to be the stages in the development of planets : The stars are localised lumps of gas within a nebula. The northern half of the earth is known as the Northern Hemisphere and the southern half is known as the Southern Hemisphere. STRUCTURE OF THE EARTH. ORIGIN OF THE EARTH'S CRUST AND ITS EVOLUTION 517 of the Precambrian rocks in Japan as a basement complex, prior to the deposition of the Paleozoic formations. It is known as the Indian Standard Time (1ST). | The crust of the Earth has two distinct types: continental crust and oceanic crust. The rest four are called Jovian or Gas Giant planets. Based on all the evidences from Seismic data and their analysis, the earth’s interior has been divided into three layers. | The planet earth initially was a barren, rocky and hot object with a thin atmosphere of hydrogen and helium. This is far from the present day picture of the earth. Eventually, growing nebula develops localised clumps of gas. The solar winds were not all that intense to cause similar removal of gases from the Jovian planets. The difference between terrestrial and jovian planets can be attributed to the following conditions: The terrestrial planets were formed in the close vicinity of the parent star where it was too warm for gases to condense to solid particles. 'Solar' means -related to the sun'. The first stage is marked by the loss of primordial atmosphere. Tectonic plates (Lithospheric plates) are constantly shifting as they drift around on the viscous, or slowly flowing, mantle layer below. Franchise About . With passage of time it cooled further and solidified and condensed into a smaller size. All the eight planets of the solar system move around the sun in fixed paths. It is thicker at continents (30 - 40 km) and its thickness underneath the ocean basin varies from 5-10 kms. The crust is the outermost layer of the earth. Volcanic activity is an … Its diametre is only one-quarter that of the earth. The sun is about 150 million km away from the earth. The equator represents the zero degree latitude. In order to locate a place, we must find out how far east or west places are from a given line of reference running from the North Pole to the South Pole. However, the present scientists do not accept either of the explanations. Earth’s Mantle. NCERT Notes Origin And Evolution Earth Part2 NCERT Notes: The Origin And The Evolution Of The Earth [Geography Notes For UPSC] NCERT notes on important topics for the IAS aspirants. Ncert Solutions Jupiter, Saturn and Uranus have rings around them. In the second stage, the hot interior of the earth contributed to the evolution of the atmosphere. These initial density differences gave rise to differences in gravitational forces and it caused the matter to get drawn together. The local time at this meridian is taken as the standard time for the whole country. This theory explains what exactly happened at the very beginning of time to our universe. In the beginning, all matter forming the universe existed in one place m the form of a “tiny ball” (singular atom) with an unimaginably small volume, infinite temperature and infinite density. The age of Earth is approximately one-third of the age of the universe. The Origin and the Evolution of the Earth (UPSC Notes):- Download PDF Here, Your email address will not be published. Finally, the composition of the atmosphere was modified by the living world through the process of photosynthesis. Articles Venus is considered as 'Earth's-twin' because its size and shape are very much similar to that of the earth. Also, the origin of many phenomena like earthquakes, volcanoes, tsunami etc are linked with the structure of earth's interior. The distribution of matter and energy was not even in the early universe. In 1920, Edwin Hubble, the man after whom the famous Hubble space telescope is named, he provided evidence that the universe is expanding and as time passes, galaxies move further and further apart. It is referred as the modern theory when it comes to the origin of earth. All paralled circles from the -equator up to the poles are called parallels of latitudes. In 1950, Otto Schmidt in Russia and Carl Weizascar in Germany somewhat revised the 'nebular hypothesis', though differing in details. Ursa Major or Big Bear is one such constellation. These are called constellations. Free Videos, Contact Us Continuous volcanic eruptions contributed water vapour and gases to the atmosphere. Each zone thus covers 15° of longitude. | During the formation of the moon, due to the giant impact, me earth was further heated up. The present composition of the earth’s atmosphere is chiefly contributed by nitrogen and oxygen. | Your email address will not be published. Light travels at a speed of 300,000 km/second. | | 90 degrees north latitude marks the North Pole and 90 degrees south latitude marks the South Pole. Title Origin of the Earth's Crust and its Evolution Author(s) Minato, M.; Hunahashi, M. Citation Journal of the Faculty of Science, Hokkaido University. During the cooling of the earth, gases and water vapour were released from the interior solid earth. Way as the Northern half of the universe to be increasing and thereby, earth! At the poles, where all the eight planets of the mantle is the outermost of... Coven by water shape are very cold phase in the early atmosphere largely contained water vapour released getting! 'Sungod ' modified by the loss of the earth process of accretion, people used to directions... As many as eleven standard times Lithosphere: the stars are localised lumps of gas where rock. Present scientists do not accept either of the equator are called the asthenosphere off. 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