The planet earth initially was a barren, rocky and hot object with a thin atmosphere of hydrogen and helium. In the final stage, these large number of small planetesimals accrete to form a fewer large bodies in the form of planets. Considering this, the distances the light will travel in one year is taken to be one light year. Edwin Hubble, in 1920, provided evidence that the universe is expanding. This assemblage was such that they could duplicate themselves converting inanimate matter into living substance. Ncert Solutions A Human-made Satellite is an artificial body. Oceans began to have the contribution of oxygen through the process of photosynthesis. The last phase in the evolution of the earth relates to the origin and evolution of life. Dec 25, 2020 - Revision Notes - Interior of the Earth, Class 11, Geography | EduRev Notes is made by best teachers of Teaching. geography optional (geomorphology) by shamim anwer this notes are by keynote ias. This non-stop movement causes stress on Earth’s crust. In this course, she teaches about various … This line is known as the equator. Finally, the composition of the atmosphere was modified by the living world through the process of photosynthesis. It is known as Nebular Hypothesis. Earth formed around 4.54 billion years ago by accretion from the solar nebula. Energy received by the Earth from solar radiations continues to exceed the energy lost by outgoing long-wave radiations from the Earth's surface up to 4:00 p.m. These are optional notes but very relevant for GS-1 Geography as well. It is about 3,84,400 km away from us. The lithosphere is the rigid outer part of the earth with thickness varying between 10 … These lines of references are called the meridians of longitude, and the distance between them are measured in 'degrees of longitude.' 2. These two types have different chemical compositions and physical properties and were formed by different geological processes. The North star indicates the north direction. It is also called expanding universe hypothesis. The moon moves around the earth in about 27 days. Light travels at a speed of 3,00,000 km/second. These notes will also be useful for other competitive exams like banking PO, SSC, state civil services exams and so on. From the outermost end of the atmosphere to the centre of the earth, the material that exists is not uniform. Till recently (August, 2006), Pluto was also considered a planet. The distribution of matter and energy was not even in the early universe. Each degree is further divided into minutes, and minutes into seconds. 3 sec, OTP has been sent to your mobile number and is valid for one hour. | The upper portion of the mantle is called the asthenosphere. This article talks about the Geography as an assimilating discipline as a science of spatial characteristics and Divisions of geography and significance of physical geography. | 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. Current Affairs | Also, the origin of many phenomena like earthquakes, volcanoes, tsunami etc are linked with the structure of earth's interior. Articles The earth has been divided into twenty-four time zones of one hour each. The solar wind was most intense nearer the sun; so, it blew off lots of gas and dust from the terrestrial planets. Each zone thus covers 15° of longitude. 1.2: Formation of planets The crust of the earth was formed from cooling and hardening of the molten matter and hot gases. It is, therefore, called a blue planet. It always remains in the same position in the sky. Sir James Jeans and later Sir Harold Jeffrey supported this argument. Planetesimals are a large number of smaller bodies. These arguments are called binary theories. During the formation of the moon, due to the giant impact, me earth was further heated up. We often call it a solar family, with the sun as its Head. He moon is the only natural satellite of the earth. The present composition of the earth’s atmosphere is chiefly contributed by nitrogen and oxygen. In 1950, Otto Schmidt in Russia and Carl Weizascar in Germany somewhat revised the 'nebular hypothesis', though differing in details. There was particularly rapid expansion within fractions of a second after the bang. The Origin and Evolution of the Earth class 11 Notes Geography in PDF are available for free download in myCBSEguide mobile app. The loss of energy through long-wave radiations from the Earth's surface exceeds the energy received from the Sun at 4:00 p.m. 3. It is huge and made up of extremely hot gases. This allowed heavier materials (like iron) to sink towards the centre of the earth and the lighter ones to move towards the surface. During the cooling of the earth, gases and water vapour were released from the interior solid earth. Upsc geography optional oceanic crust vs continental what are endogenic and exogenic forces upsc geography endogeic movement optionals ias mains geography origin Origin And Evolution Of Life On Earth Pmf IasInterior Of The Earth Crust Mantle And Core CleariasLandforms And Evolution River Course OnNcert Notes Earth Origin And Evolution Geography For UpscEarth S Layers Crust… Earth’s Interior. It is a group of seven stars. The inner planets are Mercury, Venus, Earth, and Mars. The age of Earth is approximately one-third of the age of the universe. At the Big Bang the “tiny ball” exploded violently. The first stage is marked by the loss of primordial atmosphere. The gravitational force within the lumps leads to the formation of a core to the gas cloud and a huge rotating disc of gas and dust develops around the gas core. The sun is about 150 million km away from the earth. Upsc civil services mains 2017 general origin and evolution of life on earth chandrayaan 2 mission legacy ias academy jee main advanced cbse neet iit optionals ias mains geography origin Origin And Evolution Of Life On Earth Pmf IasNcert Notes Earth Origin And Evolution Geography For UpscOrigin And Evolution Of Life On Earth Pmf IasOrigin… Read More » | (2013) Define the term ‘meander’ and describe the basic characteristics of entrenched meander and ingrown meander. The first stage of the evolution of Lithosphere, Atmosphere, and Hydrosphere is marked by the loss of the primordial atmosphere. Mathematician Laplace revised it in 1796. Latitudes are measured in degrees. The nebula from which our Solar system is supposed to have been formed, started its collapse and core formation some time 5-5.6 billion years ago and the planets were formed about 4.6 billion years ago. 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. Life was confined to the oceans for a long time. The carbon dioxide in the atmosphere got dissolved in rainwater and the temperature further decreased causing more condensation and more rains. Our Solar system consists of eight planets. It is not possible to know about the earth’s … As time passes, galaxies move further and further apart. The small pieces of rocks which move around the sun are called meteoroids Q A galaxy is a huge system of billions of stars, and clouds of dust and gases. Another imaginary line running on the globe divides it into two equal parts. The sun is in the centre of the solar system. The ozone layer was formed. Evolution of the Earth. Some countries have a great longitudinal extent and so they have adopted more than one standard time. 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Understanding the basic structure of earth is very important to learn higher concepts well. NCERT Notes The Origin Evolution And Theories Of The Earth NCERT Notes: Earth - Origin & Evolution [Geography Notes For UPSC] NCERT notes on important topics for the UPSC civil services exam. 90 degrees north latitude marks the North Pole and 90 degrees south latitude marks the South Pole. STRUCTURE OF THE EARTH. Lalit Sardana Sir Continental Drift; Convection current and seafloor Spreading; … These are belts of small debris These nngs may be seen from the earth with the help of powerful telescopes. | The age of Earth is approximately one-third of the age of the universe. Due to gradual increase in density the temperature inside has increased. Galaxies spread over vast distances that are measured in thousands of light-years. We can locate the position of the Po Star with the help of the Saptarishi. Our solar system consists of the sun (the star), 8 planets, 63 moons, millions of smaller bodies like asteroids and comets and huge quantity of dust-grains and gases. It is brittle in nature. A volcano is an opening in the earth’s crust through which gases, molten rocks materials (lava), ash, steam etc. Therefore, if rays are always slanting and provide less heat. NCERT notes on important topics for the IAS aspirants. These are, therefore, called Temperate Zones. The sun is the ultimate source of heat and light for the solar system. | At a later date, the arguments considered of a companion to the sun to have been coexisting. There was no atmosphere on early earth. They are found between the orbits of Mars and Jupiter. Our earth, however , is part of a vast universe. In the second stage, the hot interior of the earth contributed to the evolution of the atmosphere. The Big Bang Theory considers the following stages in the development of the universe. The rest four are called Jovian or Gas Giant planets. The UV rays from the sun brokeup water into Hydrogen and Oxygen and the lighter H2 escaped. Hydrogen and helium were the gases which intially formed the earth's atmosphere. | 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. 'Sol’ in Roman mythology is the 'Sungod'. Within 3,00,000 years from the Big Bang, temperature dropped to 4,500 K (Kelvin) and gave rise to atomic matter. Category : UPSC Early Theories of the Origin of the Earth . It is about 2,900 kilometers thick and makes up 84% of Earth’s total volume. From the crust to the core, the density of the material increases. About An alternative to this was Hoyle's concept of steady state. In ancient times, people used to determine directions during the night with the help stars. 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