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 . 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. 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 . Trench. A deep depression of the sea floor caused by the . subduction. of one plate under another. . Convergent Subduction Plate Boundary. Oceanic-Continental. Rift Zones. An area in the middle of a continental plate where the plate is beginning to separate. A large valley will form in the area as the crust thins.. 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. quiet. .. Homework in your . folder. .. Begin the . quick. . review. . section of your notes.. Raise your . hand. . if you need something.. Quick Review. Each of the following situations illustrates one of Newton’s Laws using the space shuttle. List which one.. Lesson. . Objectives:. To understand what occurs at different plate boundaries.. Success Criteria:. Create an annotated diagram of each plate boundary.. Plate 1. Plate 2. Continental crust. THE WORLD’S MAIN PLATE BOUNDARIES. 50 cm farther apart in the next 20 years.. Solution . Write an equivalent rate.. Tracking Tectonic Plates. Scientists use lasers to track the movements of tectonic plates. They bounce laser light off satellites and measure the distance from each satellite to the ground. As the plates move, the distance changes. With this tracking system, scientists know exactly how much tectonic plates move each year.. 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 . Rocks, soils, minerals, sediments, magma. The Grand Canyon, AZ. https://www.youtube.com/watch?v=WwiiOjyfvAU. What are the layers of the Earth?. Layers of the Earth. Crust. - O, Si, Al . Mantle. - O, Si, Mg, Fe. 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. . Ghafoor. 5. th. hour. 12-9-16. Oceanic V.S Continental Crust . Oceanic Crust . It is composed of several layers, not including the overlying sediment. . Oceanic crust is about 6 km (4 miles) thick..