Acommunity of prokaryotes, when small prokaryotes capable colonization of land animals origin of solar system and earth. Find powerpoint presentations and slides using the power of, find free presentations research about theories of the origin of the earth ppt. Questions about the origins and nature of earth have long preoccupied human thought and the scientific endeavor. Introduction and origin of the earth geology, what is it. Origin of life begins with the origin of the universe. The typical density of continental rocks is about 2. This slide describes various theories about origin of the earth, like nebular theory, big. But the processes by which planets, stars, galaxies, and the universe form and change over time are also types of evolution. It is not only the study of the earth as we see it today, but the history of the earth as it has evolved to its present condition. Perhaps the most fundamental and at the same time the least understood biological problem is the origin of life. Ncert general science origin of life on earth the universe is very old almost billion years old. In the southern hemisphere, the lights are called the aurora australas. Based on the ages of meteorites, earth is thought to be 4. Theories of the origin of the earth ppt xpowerpoint.
An overview of the question of how life first arose on earth. Begin with the story of fritz haber, and how he followed up his discovery of a procedure for industrial nitrogen fixation by spending years trying to extract gold from seawater. Banded iron formation an overview sciencedirect topics. The origins course tracks the origin of all things from the big bang to the origin of the solar system and the earth. Earth day 1970 gave a voice to an emerging public consciousness about the state. Nearly all branches of natural science have contributed to understanding of the main events of earths past, characterized by constant geological change and biological evolution.
Steiner t he origin of things has always been a central concern for humanity. Does the geologic history of the earth lead to the formation of life. It is not known how this early life form evolved, but scientists think it was a natural process which happened about 3,900 million years ago. Origin of the universe the universe began about 14. This finding triggered a wave of new thinking about both the origin and nature of life. A free powerpoint ppt presentation displayed as a flash slide show on id. The crust is truly an amazing and astonishing thing to learn and behold. It includes not only the surface process which have shaped the earths surface, but the study of the ocean floors, and the interior of the earth. The origin and the evolution of the earth authorstream presentation. The chemistry of meteorites and sun provide constraints on the composition of the bulk of the earth. The history of earth every year on april 22, earth day marks the anniversary of the birth of the modern environmental movement in 1970. Hydrosphere origin and evolution of the hydrosphere.
Chapter 1 introduction hat is the origin of coal and oil. The light from distant galaxies is shifted to lower frequencies red shift similiar to the way the sound of a horn on a passing train or car shifts to a lower pitch. Here, let us know in brief about the origin of life on earth. It is not very likely that the total amount of water at earths surface has changed significantly over geologic time. The crust is a very small fraction of earths mass, so it is not a very useful indicator of bulk composition. However, scientists in later period took up the problems of origin of universe rather than that of just the earth or the planets. The planets where formed out of a cloud of material associated with a youthful sun, which was slowly rotating. The chemistry of meteorites and sun provide constraints. Ppt the layers of the earth powerpoint presentation. Phylogenetic studies favour a single origin of land plants from charophycean green algae box 1.
By donatien ishimwe, junior student in petroleum chemistry, american university of nigeria relevant articles. The origin of the universe, earth, and life the term evolution usually refers to the biological evolution of living things. As a more relevant example, consider the origin of the earth, a question which for long was a puzzle to geologists and astronomers but is now well if not completely understood. As we prepare to mark 50 years of earth day in 2020, lets take a look at the last halfcentury of mobilization for action. Planets and stars the origin of the earth howstuffworks. The conditions and the forms of life on earth were entirely different from what we see today. It explains the moons lower density, lack of iron and oxygen isotope ratios that are identical to earths apollo. Therefore, the amount of radiation output from the sun to the earth has increased by 25 to 30% over geologic time see history of the sun. Genesis and the origin of coal and oil by trevor major, m. The layers of the earth this slide show is a minilesson on the layers of the earth. Earth developed continents and water perhaps even oceans and environments in which microbial life could emerge 4.
The origin of the earths ocean has been discussed on the basis of deuterium hydrogen ratios dh of several sources of water in the solar. There are various scientific theories of origin and evolution of the earth. Origin of earth scientific and engineering theories and. Ncert notes on important topics for the upsc civil services exam. Everything evolved from one form to another for a better chance of survival. Jeffrey taylor hawaii institute of geophysics and planetology about scientists met december, 1998, in monterey, california, to share ideas about the formation and very. Evolution of large plants, trees, flowers, grasses 600 mya creation of ozone o3. The earths origin according to the widely accepted nebular hypothesis, the planets and moons in the solar system, including earth, formed from a huge cloud of mostly hydrogen and helium. Origin and evolution of earth the national academies press. The mantle accounts for about 84% of earths volume but the core contains almost 70% of the planets mass.
This article talks about the geography syllabus for ias exam as an assimilating discipline as a science of spatial characteristics and divisions of geography. Origin and interior of the earth taylor perronoliver jagoutz. Based on the ecology of living species, a freshwater origin of land plants seems likely, but direct evidence from the fossil record is inconclusive as midpalaeozoic charophytes are found in both freshwater and, more commonly, marine facies47. The origin of the universe, earth, and life science and. Abiogenesis is also called spontaneous generation and it was disproven by experiments from. The planets where formed out of a cloud of material associated with. The light frequency shift can be explained in the same way. Most of the hypotheses of the origin of life will fall into one of four categories. The origin of life on earth is a highly curious thing. According to the evolutionary models of stars, their brightness, or luminosity, increases from their youthful to their mature stage. Hydrosphere hydrosphere origin and evolution of the hydrosphere. The lava surface continued outgassing restoring the atmosphere.
There are many ideas, but few clear facts most experts agree that all life today evolved by common descent from a single primitive lifeform. According to the consensus theory the earth was formed approximately 4. Origin of life on earth evolution of life on earth adaptive radiation biological evolution origin and evolution of man timeline of evolution. Hypothesis 1, the traditional contention of theology. In some ways, the term earth system is a more useful one than the environment, not least because it highlights the fact that the natural world is a dynamic, complex entity with its own laws and processes, rather than being simply a. Origin of the universe the big bang theory an astonishing observation was made in the late 1920s. The solar system is composed of a set of radically different types of planets and moons from the gas giants jupiter, saturn, uranus, and neptune to the rocky inner planets.
Banded iron formation bif is both the most easily identifiable of all sedimentary rocks and the one whose origin is most enigmatic. Click for next slide what are the layers of the earth. View and download powerpoint presentations on theories of the origin of the earth ppt. Biology is brought to you with support from the amgen foundation. Early theories origin of earth nebular hypothesis 1796. The origin and the evolution of the earth authorstream. Contraction, rotation, and dropping temperatures resulted in the formation of small particles, the first being nickel and iron. Centuries of studying earth, its neighboring planets, and meteorites have enabled the development of models. The course follows the evolution of life on our planet through deep geological time to present life forms. Spontaneous generation redi maggots come from flies not meat pasteur bacteria in the air contaminate liquids.
Origin earth is a hawkes bay based and owner operated boutique dairy company. These notes will also be useful for other competitive exams like banking po, ssc, state civil services exams and so on. The origin of life on earth is a scientific problem which is not yet solved. Origins formation of the universe, solar system, earth. The earths magnetic field is the source of the aurora borealis, the dramatic lights that appear when solar radiation bounces off the earths magnetic field. Remarkable eras of oil and gas industry petroleum is defined as any mixture of hydrocarbons that can be recovered from a. Although it is the most studied planet, it cannot be completely understood in isolation. Its flamboyant mesoscale banding is defined by planar variations in the proportions of the two main mineral components quartz and iron oxides.
Today, the consensus is that miller and urey had the wrong atmospheric components in their apparatus, so the process they discovered was probably not representative of the emergence of life on earth. Astr 380 the history of the earth university of maryland. It is central to many scientific and philosophical problems and to any consideration of extraterrestrial life. Origin and evolution of earth research questions for a changing planet questions about the origins and nature of earth have long preoccupied human thought and the scientific endeavor. In fact, many scientists have dedicated their entire lives to finding out how life came to be on earth. Astr 380 the history of the earth the real purpose of stonehenge. But how did the first organisms on the only known home to life in the universe develop from the primordial soup. Therefore, it is reasonable to assume that both water and rare gases were at the earths surface virtually at the time of formation of the earth. The early earths atmosphere the earth may have started with a hydrogen atmosphere which it could not hold on to for long.
The most important information about composition comes from looking around us. During the collision that created the moon all of this atmosphere was lost. Trendall, in reference module in earth systems and environmental sciences, 20. The presence of water on the young earth was confirmed when the zircons were analyzed for oxygen isotopes and the telltale signature of rocks that. The origin of water on earth, or the reason that there is clearly more liquid water on the earth than on the other. Presentations ppt, key, pdf logging in or signing up.
The magnetic field of the earth introduction studies of the geomagnetic. Originofwateronearth watercoversabout75%oftheearthssurface theoriginofwateronearth,orthereasonthatthereis clearlymoreliquidwaterontheearththanontheother. The lava surface outgassed carbon dioxide, sulfur dioxide, water and ammonia. The origin and structure of the universe what is the universe made of. Earth that has played a prime role in the earths evolution. The history of earth concerns the development of planet earth from its formation to the present day.
502 118 32 627 1534 79 678 1494 1001 345 496 1236 110 1271 768 482 372 94 155 1474 1083 933 272 1276 768 1265 1470 1277 1308 74 1365 1396 1188 718 1304 307 486 1413 412 1328 1304 995