Studies of the chemistry of rocks from arc volcanos indicate the main source of the magma is ________
A) melting of the asthenosphere above the subducting oceanic plate by frictional heating on the subduction interface
B) melting of the subducted mantle lithosphere
C) melting of the asthenosphere above the subducting oceanic plate by fluids acting as a flux to enhance melting
D) melting of subducted oceanic crust
C
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Volcanic activity generally does NOT occur
A) along sea-floor spreading centers. B) in association with plutons. C) along subduction boundaries. D) in association with hot spots over plumes in the mantle.
List some items that can be done to address global climate change:
An ENSO will deliver warm equatorial waters to the western Pacific around Christmastime.?
Indicate whether the statement is true or false
About ________ percent of Canada remains in territorial status
A) 75 B) 60 C) 40 D) 25