PPT-Earth’s formation and early history

How old is the earth How old is our earth Aristotle thought the Earth had existed eternally Early Romans believed its formation was relatively recent due to no records before the Trojan War 1640 Ussher calculated Earth was created in . Canada’s Geologic History. - By carefully analyzing landforms, rocks and fossils. - A fossil of an animal that was around on earth at a particular time in history. Index Fossils. 4, 600, 000, 000 years ago. Vincent . Geers. Institute for Astronomy, ETH Zurich. Star & Planet Formation group. A. . Banzatti. , S. . Bruderer. , F. . Lahuis. , I. . Pascucci. , Th. Henning, . P. . Ábrahám. , A. . Juhász. Chemical conditions of the early Earth. . A model for the first cells. First life. Life changes the planet: oxygenating Earth’s oceans and atmosphere. Eukaryotic cells descended from prokaryotic cells. Geochronometry. Isotope tracing. History . of “primordial” . Pb. Meteorite samples . Chondrite. – a primitive, undifferentiated meteorite. CI refers to a particular class of carbonaceous . chondrite. Part 1 . Origin of the elements . Part 2. Geochronometry. : Age of Earth . Formation of Earth and Moon. Differentiation of core and mantle. . Isotope tracing: sequence of events. . What have we learned so far?. NS3310 - Physical Science Studies. Geologic Time. Relative Time. Law of Superposition. Uniformitarianism. Unconformities. Absolute Time. Radiometric Datine. Earth History. Hopscotch Through Geologic Time. Chapter . 5. Meteorites. Primitive. Chondrites (stones). Ordinary Chondrites (H, L, LL). Enstatite Chondrites (EH, EL). Carbonaceous Chondrites (CI, CV, CM, CO, . etc. ). Misc. rarer classes. Further subdivided by ‘petrologic grade’. …earliest phase of . Earth heating…. …first seas…. …thin atmosphere of . H, CO. 2. , H. 2. O, N. 2. , CO, NH. 3. , CH. 4. . …early bombardment…. Early Bombardment. 2 phases?. Relative dating. This week we will look at a few more . commonly used “evidences” that . the earth is old. Again we need to keep in mind the flood if we are going to explain these observations in a young world, and the observations tend to give strong evidence for the flood . Geochronometry (methods). Nuclear synthesis. Meteorites. Age of the Earth accretion. Pb . Formation of the core . Formation of the core (energy considerations). Formation of crust. Plate tectonics starts. Geological Time Scale. AIM: . How have stratigraphy and radiometric dating been used to construct the geological time scale?. The History of Earth. Earth’s history has been studied through 2 methods:. Midterm 2. Preparation/Review. Style of Questions. Matching term w/ definition. Short definition of concepts/processes. Name some of multiple characteristics. 25% of points from Part II Quizzes. REVIEW . Conditions on early Earth made the Origin of Life possible.. Current theory about how life on Earth began.. Earth formed about 4.6 billion years ago.. Earth was too hot and still being bombarded by meteors, any water evaporated.. Michelle Kirchoff. Southwest Research Institute. Center for Lunar Origin and Evolution. Southwest Research Institute in Boulder. http://. www.boulder.swri.edu. /. Center for Lunar Origin and Evolution (CLOE).