PPT-Earth History GEOL 2110

The Paleozoic Era Part 4b Stratigraphy and Tectonics of Silurian and Devonian Periods Major Concepts The proliferation of coral reefs caused restricted basins wherein great thickness of limestone and . *Correspondingauthor.E-mailaddresses:fcorsett@usc.edu(F.A.Corsetti),kaufman@geol.umd.edu(A.J.Kaufman).Earth-ScienceReviews73(2005)63 The . Sun. Is HOT!!!. The sun is an . average . star . The heat and light are the result of . Nuclear Reactions . constantly taking place in the sun.. It is in the . center. of our solar system. . Comparison . The Earth is divided into three layers based on the compounds that makeup each layer. They are:. 1. Crust. 2. Mantle. 3. Core. The Crust. The Crust is the :. 1. outer most layer of the Earth.. 2. It is the thinnest layer.. The Layers of the Earth. The Earth is an oblate spheroid – the . Solid Earth. . . It is composed of a number of . different layers. as determined by deep drilling and . seismic. evidence.. The Four Basic Layers. Lab . 2 . - . Locating Earthquakes . Sept. . 9 . - . 14, . 2012. Department of Earth Sciences. Department of Earth Sciences. EARTHQUAKES . | . 2. LAB . 2 . - . EARTHQUAKES . - KEY CONCEPTS. Reading seismograms. Lecture . 9. Absolute Dating of the Earth. Major Concepts. The discovery of radioactivity in the early 1900’s and the recognition that . radioactive deca. y . (a statistical event) . occurs at a constant average rate for particular unstable isotopes has provided a means of determining the absolute ages of earth materials. Lecture 9. Absolute Dating of the Earth. Major Concepts. The discovery of radioactivity in the early 1900’s and the recognition that . radioactive decay . (a statistical event) occurs at a constant average rate for particular unstable isotopes has provided a means of determining the absolute ages of earth materials. The Mesozoic Era. Geologic and Tectonic History of the . North American Cordilleran. Major Concepts. The geologic history of Cordilleran . Orogen. of North America during the Mesozoic Era was dominated . 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 . 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 . 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.. COMMON plumeswere initially thought to consist of primitive mantle (e.g., Schilling, 1973). As we found, mixing be-tween primitive and depleted mantle can explain the Sr and Nd isotopic compositions JournalofGeologyKUNLUNACCRETIONARYTECTONICS693etal.2000)andnowisinfaultcontactwiththeYixiekevolcanicrocks(g.3).Ithashigh(11.6%)andhighSrratios()butslightlylower)values0.7097 Semester ‘year1. Fall Semester ‘year2. Spring Semester ‘year2. Fall Semester ‘year3. Spring Semester ‘year3. Fall Semester ‘year4. Spring semester ‘year4. GEOL. 1101 (1). Sci as Profession.