Chapter2 - Chapter 2: The Earths Mobile Crust Continental...

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1 Chapter 2: The Earth’s Mobile Crust Plate Tectonics The Earth’s interior Plate Boundaries Continental Margins Tectonic Classification of Coasts Tectonic effects on coastal sediment supply Continental Drift-Plate Tectonics continents had once been together Alfred Wegener 1920’s Rejected (gravity Earth, Moon, Sun) Continental Drift-Plate Tectonics New evidence Sea floor mapping Magnetic anomalies Earthquake distribution Heat flow Radiometric dating Satellites Theory of Mantle Convection (Hess, 1960s) Shallow epicenters- Crustal movement Mid-deep epicenters subduction Seismic refraction = Factors Chemistry Density Physical State (liquid or solid) Layered Structure of Earth
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2 Formation of the Universe, Solar System, Earth – Big Bang, 13 bya – Formation of elementary particles – Gravitational formation of dense regions 12 bya first stars 4.55 bya Rotating cloud of gas from which sun and planets formed, initiated by “supernova” = exploding star – Accretion (Gaining material) – Differentiation (Separating based on density) – Evidence of rocks and water- 3.9 bya Layered Structure of Earth Outer core: 2258km thick, 3200C, liquid (partially melted) Layered Structure of Earth Mantle: 70% Earth’s volume, 2866m thick, 100-3200C, Mg-Fe silicates, solid but can flow Mohorovicic discontinuity: chemical boundary between
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Chapter2 - Chapter 2: The Earths Mobile Crust Continental...

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