The Nature of Selection. Do check out the sample questions These clumps continue to grow into even denser gaseous bodies, giving rise to formation of stars. TABLE OF CONTENTS. Finally, the composition of the atmosphere was modified by the living world through the process of photosynthesis. The moon moves around the earth in about 27 days. Like the origin of the earth, there have been attempts to explain how the moon was formed. It always remains in the same position in the sky. Some countries have a great longitudinal extent and so they have adopted more than one standard time. | However, with greater. Sometime around 3,800 million years ago, life began to evolve. Sample Papers The areas bounded by the Tropic of Cancer and the Arctic Circle in the Northern Hemisphere, and the Tropic of Capricorn and the Antarctic Circle in the Southern Hemisphere, have moderate temperatures. Why Studyadda? An alternative to this was Hoyle's concept of steady state. Thus, it was difficult to number the meridians. Antarctic Circle at 66'/2° south of the equator. As a result the material  inside started getting separated depending on their densities. However, around 2,500-3,000 million years before the present, the process of photosynthesis got evolved. During the cooling of the earth, gases and water vapour were released from the interior solid earth. The North star indicates the north direction. Franchise Some scientists believe that the life came from outerspace. This is a video lecture on NCERT Class 11 Geography Part 2 - Fundamentals of Physical Geography. The following are considered to be the stages in the development of planets : The stars are localised lumps of gas within a nebula. People, since the early times were eager to know about the origin of Earth and the evolution of life on it. As the earth cooled, the water vapour released started getting condensed. Biol1006 lecture notes fall 2018 4 wallace line big the origin and evolution of earth cl 11 notes geography life and rocks may have co evolved on earth science notes on lesson of the earth kullabs the origin and early evolution of life on earth biosci. This led to a huge expansion. The study of history of life forms on earth is called evolutionary biology. Origin and Evolution of Life and Introduction to Classification BIOLOGY Notes The planet earth came into existence sometime between 4 and 5 billion years ago. The light of the sun takes about eight minutes to reach the earth. Earth and the other celestial bodies in the solar system has always been a subject of fascination for all of us. This led to a huge expansion. NCERT Book for Class 11 Geography Chapter 2 The Origin and Evolution of the Earth is available for reading or download on this page. The early atmosphere, with hydrogen and helium, is supposed to have been stripped off as a result of the solar winds. There are four important parallels of latitudes : Tropic of Cancer \[(23{{{}^{1}/{}_{2}}^{o}}N)\]in the Northern Hemisphere. Jobs The Origin and Evolution of Life on Earth. Light travels at a speed of 3,00,000 km/second. | For example, in Russia, there are as many as eleven standard times. It provides the pulling force that binds the solar system. Introduction and Origin of the Earth Geology, What is it? This meridian is called the Prime Meridian. Venus is considered as 'Earth's-twin' because its size and shape are very much similar to that of the earth. Solved Papers The present composition of earth's atmosphere is chiefly contributed by nitrogen and oxygen. 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. As a result, a cigar-shaped extension of material was separated from the solar surface. The Origin of Life and Evidences of Evolution: 1. This happened not only in case of the earth, but also in all the terrestrial planets, which were supposed to have lost their primordial atmosphere through the impact of solar winds. Hydrogen and helium were the gases which intially formed the earth's atmosphere. The rainwater falling onto the surface got collected in the depressions to give rise to oceans. There was, however, no evidence to support these claims.The early scientists and Greeks believed that life on earth never began on earth itself. They are found between the orbits of Mars and Jupiter. You can also find Revision Notes - The Origin and Evolution of the Earth, Class 11, Geography | EduRev Notes ppt and other Teaching slides as well. All parallels north of the equator are called 'north latitudes.' Eventually, oceans were saturated with oxygen, and 2,000 million years ago, oxygen began to flood the atmosphere. Note carefully that the curve plotscumulative O 2 production, but that until a few hundred million years ago, most of this was taken up by Fe(II) compounds in the crust and by reduced sulfur; only after this massive "oxygen sink" became filled did free O 2 begin to accumulate in the atmosphere. In Size, it is the fifth largest planet. Modem scientists refer to the origin of life as a kind of chemical reaction, which first generated complex organic molecules and assembled them. 'Solar' means -related to the sun'. 0 . perfect preparation. It is through the process of differentiation that the earth forming material got separated into different layers. Evolution- CBSE Notes for Class 12 Biology. Articles This started the evolution of the present atmosphere. 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. Within first three minutes from the Big Bang event, the first atom began to form. When Did Life Begin on Earth? These formed the bases for development of galaxies. 90 degrees north latitude marks the North Pole and 90 degrees south latitude marks the South Pole. The northern half of the earth is known as the Northern Hemisphere and the southern half is known as the Southern Hemisphere. Areas lying between the Arctic Circle and the North Pole in the Northern Hemisphere and the Antarctic Circle and Hemisphere, are very cold. There are eight planets in our solar system. The diameters of individual galaxies range from 80,000-1,50,000 light years. A large number of hypotheses were put forth by different philosophers and scientists regarding the origin of the earth. It is because here the sun does not rise much above the horizon. | The following are considered to be the stages in the development of planets : The stars are localised lumps of gas within a nebula. These lines of references are called the meridians of longitude, and the distance between them are measured in 'degrees of longitude.' It is about 3,84,400 km away from us. The hypothesis considered that the planets were formed out of a cloud of  material associated with a youthful sun, which was slowly rotating. Considering this, the distances the light will travel in one year is taken to be one light year. The inner planets rocky while others are mostly in gaseous form. Similarly, the distance between the galaxies is also found to be increasing and thereby, the universe is considered to be expanding. 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. In the second stage, the hot interior of the earth contributed to the evolution of the atmosphere. Multiple choice question(i) Which one of the following figures represents the age of the earth? During the cooling of the earth, gases and water vapour were released from the interior solid earth. Life was confined to the oceans for a long time. It is slightly flattened at the poles. In 1950, Otto Schmidt in Russia and Carl Weizascar in Germany somewhat revised the 'nebular hypothesis', though differing in details. 'Sol’ in Roman mythology is the 'Sungod'. Each zone thus covers 15° of longitude. Our Solar system consists of eight planets. 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. However, around 2,500-3,000 million years before the present, the process of photosynthesis got evolved. These are, therefore, called Frigid Zones (very cold). Miller in 1953, conducted an experiment to show the origin of life on earth in the physical environment similar to condition prevails at that time. | Early Theories. 180° East and 180° West meridians are on the same line. Starting from the surface to the central parts, we have layers like the crust, mantle, outer core and inner core. The research to find the age of Earth started long back. this is your one stop solution. The early atmosphere, with hydrogen and helium, is supposed to have been stripped off as a result of the solar winds. During the formation of the moon, due to the giant impact, the earth was further heated up. | Continuous volcanic eruptions contributed water vapour and gases to the atmosphere. The earth has been divided into twenty-four time zones of one hour each. Sometime around 3,800 million years ago, life began to evolve. Many Molecules Required for Life Can … The solar wind was most intense nearer the sun; so, it blew off lots of gas and dust from the terrestrial planets. In the second stage, the hot interior of the earth contributed to the evolution of the atmosphere. The carbon dioxide in the atmosphere got dissolved in rainwater and the temperature further decreased causing more condensation and more rains. Revision Notes - The Origin and Evolution of the Earth, Class 11, Geography | EduRev Notes chapter (including extra questions, long questions, short questions, mcq) can be found on EduRev, you can check Related. Then came the theory of spontaneous generation of life durin… Trending Posts. 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 Due to gradual increase in density the temperature inside has increased. Starting from the surface to the central parts, we have layers like the crust, mantle, outer core and inner core. A light year is a measure of distance and not of time. The whole mass became a dumb-bell-shaped body and eventually it broke. Notes of Chapter 2 The Origin and Evolution of the Earth Class 11th Geography Early Theories Origin of the Earth Nebular hypothesis • Proposed by German philosopher Immanuel Kant. The solar winds were not all that intense to cause similar removal of gases from the Jovian planets. How Did Life Begin on Earth? The microscopic structures closely related to the present form of blue algae have been found in geological formations much older than some 3,000 million years. This tells us that the oceans are as old as 4,000 million years. Cooled further and solidified and condensed into a smaller size around its axis, was... 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