11-10-08 - Geography 1111 11-10-08 Volcanism and Volcanic...

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Geography 1111 11-10-08 Volcanism and Volcanic Landforms 1. Landform overview 2. Sites of current volcanisms 3. Types of magma 4. Volcanic landforms Shield volcanoes Cinder cones Composite volcanoes Intrusive plutons and volcanic necks Landforms Surface configuration of the land Balance between: o Internal forces that push the crust upward o Denudation processes that weather and erode the crust Internal forces are: o Volcanism o Tectonic activity Volcanism Formation of new igneous rock at the earth’s surface o Magma erupts cools forms rock Extrusive: creates landforms immediately Intrusive: doesn’t become a landform until the overlying rock is removed Eruption involves: o Lava: comes out of the volcano o Gases: discharged from volcanic material o Pyroclastics (ash, tephra): pieces of things that have accumulated from weathered or eroded material Sites of Current Volcanism Plate boundaries: such as pacific plates hitting N and S Hot spots: i.e. Hawaii
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This note was uploaded on 01/17/2011 for the course GEOG 1111 taught by Professor Hopkins during the Fall '08 term at University of Georgia Athens.

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11-10-08 - Geography 1111 11-10-08 Volcanism and Volcanic...

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