GLG 112 1st Edition Lecture 28Outline of Last Lecture C. LocationsD. ExamplesHazardsI. Lava FlowsA. What is it?B. Associated volcanoesC. HazardsOutline of Current LectureII. Tephra A. What is it?B. Associated volcanoesC. Hazards Current LectureTephra are cooled pieces of lava that range from tiny pieces of ash to slightly bigger lapilli (think of a walnut size) to bombs (can be as big as a car). Ash travels the fastest because they are the smallest. Lapilli actually means “little stones” in Italian and travel farther than bombs but not as far as ash. Bombs don’t travel very far at all which is good because they are the most dangerous. Tephra comes from gas rich eruptions.Basaltic tephra comes from cinder cones, andesitic tephra comes from composite cones, and rhyolitic tephra comes from calderas. Obviously, if you are less than three kilometers away from the peak when it erupts you will experience more deadly tephra hazards. These can include bombs, asphyxiation, burial, and fires. If you are more than three kilometers away there are less tephra related hazards. 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.However, there is the possibility of airplanes flying into ash clouds and causing engine
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