GEO 120 – WSC EXAM WITH COMPLETE QUESTIONS AND ANSWERS { GRADED A+}

GEO 120 – WSC EXAM WITH COMPLETE

QUESTIONS AND ANSWERS { GRADED

A+}




locations of igneous activity - ✔✔subduction zones


Hot Spots


Divergent Plate boundaries


Magma Viscosity - ✔✔Viscosity - resistance of magma to flow


honey - high viscosity


water - low viscosity


•Viscosity increases as silica content increases.


Felsic magmas have a _________ Viscosity - ✔✔high


Mafic magmas have a ________ viscosity - ✔✔low

, Lava - ✔✔Magma that reaches Earth's surface


pyroclastic material - ✔✔fragmented magma resulting from gas expansion during

an eruption


What is erupted first? Magma or Pyroclastic material - ✔✔Pyroclastic material


pyroclastic flow - ✔✔mix of ash and air that forms a fast moving avalanche


pyroclastic fall - ✔✔ash that settles gently from the air


Basaltic explosions - ✔✔low viscosity and minimal pyroclastic material


Andesite explosions - ✔✔Intermediate viscosity and about same amount of lava

and pyroclastic material


Rhyolitic Eruptions - ✔✔high viscosity and large quantities of pyroclastic

material


magma chamber - ✔✔the pocket beneath a volcano where magma collects


chimney - ✔✔the ventricle conduit through which magma travels to the Earth's

surface


Summit Vent - ✔✔primary chimney through the crater