Which two geologic processes result from vertical circulation within the mantle?
a. The upwelling of hot rock at trenches results from the mantle's downward circulation, while the subduction of oceanic plates along oceanic trenches results from the mantle's upward circulation.
b. The upwelling of hot rock along oceanic ridges results from the mantle's downward circulation, while the subduction of oceanic plates at trenches results from the mantle's upward circulation.
c. The upwelling of hot rock along oceanic ridges is the result of the mantle's upward circulation, while the subduction of oceanic plates at trenches is the result of the mantle's downward circulation.
d. The subduction of hot rock along oceanic ridges results from the mantle's downward circulation, while the upwelling of oceanic plates at trenches results from the mantle's upward circulation.
e. The upwelling of hot rock along oceanic ridges is the result of the mantle's upward circulation, while the subduction of oceanic plates at trenches is the result of the mantle's downward circulation.
c. The upwelling of hot rock along oceanic ridges is the result of the mantle's upward circulation, while the subduction of oceanic plates at trenches is the result of the mantle's downward circulation.
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