GLG 112 1st Edition Lecture 25Outline of Last Lecture II. Cinder conesA. AppearanceB. Formation1. Strombolian eruptions2. Lava flowsC. LocationsD. Examples Outline of Current LectureIII. Composite ConesA. AppearanceB. FormationC. LocationsD. Examples Current LectureAppearance - Pretty tall- Slope varies (10-30 degrees)- Fairly large- Small crater possible- Obvious peak/summit- “classic volcano”- Age=10s to 100s of years oldThese 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.FormationMagma type: intermediate (andesite)Volatile content: gas-poor OR gas-richEffusive (lava flows) OR explosive (plinian eruptions (ash clouds))LocationSubduction zonesExamples-Cascade Mtns (Mt. St. Helens – lost 1312 ft in elevation in 1980)-Aleutian Islands-San Francisco Mtn. (used to be 3000 ft.
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