This Week's set of notes
This Week's set of notes GEOL 1210
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This 3 page Class Notes was uploaded by Vani Singh on Sunday March 6, 2016. The Class Notes belongs to GEOL 1210 at University of North Carolina - Charlotte taught by in Spring 2016. Since its upload, it has received 12 views. For similar materials see Earth History in Earth Sciences at University of North Carolina - Charlotte.
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Date Created: 03/06/16
Origin of Earth Solar Nebula Theory (4.56 billion yrs. ago) Exploding star initiated the process of the birth of our solar system and Earth Nebulas consist of hydrogen and helium left over from the Big Bang Ex. Eagle Nebula Our galaxy, the Milky Way, spins counterclockwise and so does everything within it The planets revolve around the sun counterclockwise Earth spins on its axis counterclockwise Compositional Gradient: Heavier elements (Nickel & iron) condensed closer to the sun (the Rocky planets) Gaseous Giants: Jovian planets, composition of lighter elements because farther away from the Sun Age of Materials: Earth The Moon Meteorites (Asteroids) Early radioactivity heated the interior of the Earth as the radiation from the sun was not powerful enough for those processes, this caused the differentiation of the Earth’s layers Meteorite Evidence Chondrites (Stony): mantle 4.56 billion years ago Ultramafic composition Early Solar System composition Iron meteorites Metallic composition Cores of planetary bodies Stonyiron meteorites Mixture of rocky and metal Boundary between core & mantle Oxygen – rich rocks: Earth’s crust & Moon Collision of Earth and the Moon caused Earth’s 23.5° tilted axis At this point in time, igneous rocks formed on Earth as it cooled down from its molten form Two sets defining Earth’s layers Composition: Crust O/Si oceanic (3 – 10 km) & continental crust (40 – 60 km thick) Mantle SiO 2 /Fe Mg 2 Core Fe/Ni Oceanic crust is denser, mafic and therefore sinks lower Continental crust is lighter, felsic and therefore more buoyant Properties: Lithosphere: brittle (stress will cause it to fracture) Plasticity vs Asthenosphere: elastic & bend Elasticity changes Mesosphere: plasticlike behavior (bend and remain in that position) Outer Core: liquid Inner Core: solid Lit hosp her e incorporates a bit of the mantle along with the crust Bowen’s Reaction Series **Destroys previous **More balanced side rocks in order to form of the series, next rock crystalline percentage
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