GLG 112 1st Edition Lecture 22Outline of Last Lecture I. Introduction to volcanoesA. Active volcanoesB. Deadliest EruptionsII. ExplosivityA. Volcanic Explosivity Index (VEI)B. Controls on explosivity1. Viscosity2. Volatile contentOutline of Current Lecture I. Shield VolcanoesA. Appearance B. FormationC. LocationsD. Examples Current LectureAppearance They have gentle slopes are wider than they are tall. They are the largest type of volcano. There is no obvious appearance of a peak. 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.FormationThey are effusive (not explosive). This means they are made of volatile-poor mafic magma. Basalt oozes slowly downward. It can ooze from anywhere, not just the summit. They are 1-2 million years old. LocationsThey are at divergent plate boundaries and oceanic hot spots. ExamplesMauna Loa is smoother than Mauna Kea. Mauna Kea is also taller. Kilauea is the most active in the United States. It is closest to the hot spot above sea level. It threatens the community of Pahoa with its lava
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