GEOS 212 1st Edition Lecture 4 Outline of Last Lecture Volcanoes 1500 could erupt 20 erupting most of the time Occur in four tectonic settings o Spreading centers o Hot Spots o Subduction Zones o Continents Pulling Apart Two main types of volcanoes o Shield Volcanoes o On oceanic crust o Not steep sides o Basalt high iron very hot o Not explosive o Not Hazardous o Lava flows runny Strato Volcanoes o On continental crust o Steep sides o Andesite lower iron cooler stif o Explosive o Hazardous o Lava flows ash cinders pyroclastic flows Diagrams of Shield Strato Volcanoes Videos of shield volcano eruptions o of volcanoes below sea surface o Importance of Kilauea o Temperature of lava o Key to forecasting eruptions o Nature of magma o Nature of basalt color texture Videos of stratovolcano eruptions These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o What else comes from volcanoes besides magma o Pyroclastic flow made up of rock ash gases o Nature of magma o Nature of andesite ash color texture o How many potentially active volcanoes o How many people live at risk from volcanoes Cascade volcanoes in Oregon Washington Eruption history of the Cascade volcanoes Caldera eruptions Currently active Volcanoes http www geocodezip com v2 activeVolcanos asp Outline of Current Lecture Review of volcanoes 1500 could erupt dormant 20 erupting today Shield volcanoes versus stratovolcanoes hazards prediction setting Transform fault 3rd type of plate boundary Atlantic example Pacific example San Andreas fault transform fault North America Pacific plate boundary Animations of earthquake process stick build up stress then slip Earthquakes along San Andreas fault Sizes magnitudes or earthquakes Views of San Andreas fault Earthquake history along San Andreas fault Global Earthquakes Sumatra Japan earthquake tsunami Animations of Sumatra earthquake tsunami Global map of earthquakes with pattern of size and depths Perspectives on big earthquakes Current Lecture
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