GEO 101 Chapter Notes - Chapter 14: Magma Chamber, Prince William Sound, Subduction
13 Nov 2017
School
Department
Course
Professor
Document Summary
Volcanic and tectonic landforms: landforms (geomorphology, landforms of volcanic activity, landforms of tectonic activity. Eruptions: active volcanoes have erupted in recent history, dormant volcanoes have no erupted, but show some evidence of recent activity, extinct volcanoes show evidence of long-term weathering and erosion. Distribution of volcanoes: related to: ocean ridges, subduction zones and other regions (e. g. hawaii is a hot spot ) Lava and landforms: viscosity of magma and lava depends on its chemical composition, felsic acidic, ultramafic/mafic basaltic, this determined by the origin/location of the volcano. Acidic lavas: contain more gas and produce more violent eruptions, can produce: projectiles (bombs), small fragments (cinders and ash, pyroclastic debris. Types of volcanoes: composite volcano (or stratovolcano, occur on subduction zones, made up of layers of lava and pyroclastics, lava is acidic and viscous with gas and therefore explosive, these volcanoes have steep sides and high elevations.
