11-12-08

11-12-08 - Geography 1111 ant icline 11-12-08 Tectonic P...

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anticline Geography 1111 11-12-08 Tectonic Processes 1. Finish volcanism 2. Basic definitions 3. Earthquakes and tsunamis 4. Tensional landforms 5. Compression landforms 6. Shear stress landforms 7. Broad non-deforming uplift Volcanism Cascade Mountains Converging plates, andesitic magma, composite volcanoes Eruption of Mt. St. Helens in May 1980 Intrusive Plutons Pluton: buried magma chamber Intrudes from below, melts surrounding rocks, incorporated into magma, gradually solidifies Intrusive igneous rocks Typically granite Volcanic Necks Neck: magma in dormant volcanic chamber solidifies o Eventually overlying rock eroded away exposes igneous pluton or volcanic neck o Ship rock- famous (2000ft tall)
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o Neck surrounded by rock Mountain Building—Tectonic Processes Deformation of rigid rock Responsible for large mountain building Result of crumpling or movement of rigid crustal material without melting it Fault-fracture in the crust deep below
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11-12-08 - Geography 1111 ant icline 11-12-08 Tectonic P...

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