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Geology of Catastrophes

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How do we understand volcanos?
in terms of plate tectonics
What determines if eruptions are peaceful or explosive?
Variations in magma's chemical composition, ability to flow, gas content and volume
what percent of volcanism is associated with plate boundaries?
90 - 80% spreading centers, 10% subduction zones; other 10 % at hot spots
cape verde type hurricanes
begin as easterlies, blow westward from trade winds, move north by coriolis in western atlantic