notes Test 4

notes Test 4 - Earths origin Structure o Inner core Solid...

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3/29/10 Earths origin Structure o Inner core: Solid iron Extremely dense VERY HOT o Outer core: Molten iron Less dense Layer that generates magnetic field o Mantle 80% of earths volume Hotter towards core Asthenosphere: Plastic layer Hot pockets—radioactive decay ---Convection currents---Deformation of crust Uppermost mantle: Solid brittle layer Part of lithosphere ( upmost mantle and crust) o Crust—brittle outer layer of earth, part of lithosphere o Oceanic crust: Underlies ocean basins Made of silica and Mg Denser than continental crust o Continental crust: Underlies continents Made of silica and AL Much thicker than oceanic crust Landforms and Relief Landorm- surface features of the land o Volcanic peak o Stream valleys o Sand dunes Relief—elevation difference between high and low points in the area Mineral – inorganic substance with a specific chemical composition and atomic structure. Rock—any combination of minerals combined in solid form o Igneous Rocks that solidify from molten mineral matter or “magma”
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Extrusive –cool very fast outside Coarse grained Intrusive---cool slowly Fine grained o Sedimentary Rocks that form from sediment that accumulates and is compacted and/or cemented o Metamorphic Rocks that form when existing rocks( any type) are subjected to heat and pressure, which causes partial melting, deformation and re-crystallization 3/31/10 Plate Tectonics Evidence o Fit of the continents o Similarity of fossils o Correspondence of ancient mountain ranges o Similarity of glacial landforms o Sea floor topography o Magnetic reversals—atlantic ocean floor History o Continents aligned with Pangaea Implications of plate break up o Changes in connectivity among land masses o Changes in continentality—less extreme temperatures now o Land at different latitude---climate change o Tectonic/gradational changes within continents Major plates o American Plate ( north and south o Pacific Plate o Eurasian Plate( Europe and asia o African Plate o Indo-Australian Plate ( india not part of asia – its part of southern plates) o Antarctic plate Plate boundaries that cut ACROSS continental masses o San andreas fault system—California o E. African Rift Valley o Himalays Types of Plate Boundaries o Spreading Centeres o Converging Plates Oceanic plate---continental plate ( subduction zone) Oceanic goes under continental
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Volcanoes Deep sea trenches o Transform Boundaries Hot spots o It melts through the solid material and comes out on the surface o Yellowstone o Hot spot island chain—hawaii Friday April 2 nd   Volcanism and Volcanic Landforms 1. Landform overview 2. Sites of current volcanism 3. Types of Magma 4. Volcanic landforms - shield volcanoes - cinder cones - composite volcanoes - intrusive plutons and volcanic necks Landforms - Surface configuration of the land
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This note was uploaded on 06/05/2011 for the course GEOG 1111 taught by Professor Hopkins during the Spring '08 term at UGA.

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notes Test 4 - Earths origin Structure o Inner core Solid...

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