PPT-Radioactivity in the Oceanic Crust

William M White Cornell University USA Creation of Oceanic Crust Oceanic crust is produced as magmas rise from the mantle below and freeze to fill the gap as lithospheric plates spread apart. According . to Alfred Wegener, the super-continent of Pangea began to break up 200 million years ago with the continents attaining the size, shape, and location where we see them today. This movement of continents has not yet come to an end. According to J. Tuzo Wilson, the breakup and drifting of the present continents . Notes. Geology – . the study of the Earth and its processes. 2. The Earth’s. . Layers. Scientists study seismic (earthquake) waves and volcanic explosions to learn about the Earth’s interior.. Fe/Mg. Increasing. Fe toward. core. Increasing. Si toward. surface. There are certain trends in Earths chemistry.. The crust is relatively depleted in Fe, Mg and enriched in Si, O. Effect of. chemical . Structure of the Earth. The Earth is made up of 3 main layers:. Core. Mantle. Crust. Inner core. Outer core. Mantle. Crust. The Crust. This is where we live!. The Earth’s crust is made of:. Continental Crust. to. . Petrology. Francis 2014. Introductory Petrology EPSC-212B. Don Francis:. Room: F.D.A. 316, . donald.francis@mcgill.ca. Documents. :. . . www.eps.mcgill.ca. /~c212 . . 1. Igneous. For . B.Sc. Chemistry (General), Part- I. By. Dr. . Kakoli. . Banerjee. Department of Chemistry. Aims and Objectives. Definition of Radioactivity . Discovery of Radioactivity- The Pioneers. Cause of Radioactivity- Nuclear Instability. Pierre Curie was already a famous scientist before he married Marie Sklodowska in 1895.  This famous couple did not only find true love, they also discovered radium and polonium.  For their groundbreaking research in radioactivity, the couple were awarded the 1903 Nobel Prize in physics.  It was Marie Curie who coined the term "radioactivity", and in her honor, the 1910 Radiology Congress chose the curie as the basic unit of radioactivity.  Pierre died from being run over by a horse drawn wagon, but Marie continued their research, and was eventually awarded a second Nobel Prize, the 1911 prize for Chemistry.  She died in 1934, suffering from pernicious anemia which had undoubtedly been the result of years of radiation exposure.. Construcive. (Divergent). Plate. Movements. Geological Process Associated. Landforms. Example. Two. plates of the oceanic crust moving apart from each other. Two plates of continental crust moving apart from each other. Ben Valentino. 1. , Eduardo Toledo. 2. , Eduardo Nobre. 2. , Luciana Vieira. 2. , . Diogo. Cintura. 2. 1. Department of Earth Sciences, SUNY Oswego. 2. Department of Civil Engineering, . Federal University of . Heat Loss . of the Earth. and. Heat Production . in the . Continental Crust. Makoto . Yamano. Earthquake Research Institute, University of Tokyo, Japan. Measurements of . s. urface heat flow. Total heat loss of the Earth. 4 Layers of the earth. 7 main plates of the earth. 3 main plate boundaries. 2 types of crust. 3 main features of plate tectonics (F.E.E.D). 3 main theorists and theories. Human interaction. Structure of the Earth. The . two types of crust are . oceanic . and . continental.. Oceanic crust is . more dense. than continental crust. .  . Convergent . boundaries . push together..  . Subduction. . is the sideways and . Theory of Plate Tectonics-. Theory that states the earth’s crust is broken into plates that float on lower mantle. Theory combines the theories of . continental drift . and . sea floor spreading . It states how and why . 1. 2. Oceanic crust. 1-Convection currents pull plates apart. . 3-As the plates move apart, magma from the mantle rises to fill the gaps and forms new oceanic crust.. 4-A mid-ocean ridge is formed by the new crust. .