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a. the rate of lithospheric production at ridges is greater than the rate of lithospheric consumption at subduction zones
b. the rate of lithospheric consumption at subduction zones is greater than the rate of of lithospheric production at ridges
c. rates of lithospheric production and consumption are equal
b. the rate of lithospheric consumption at subduction zones is greater than the rate of of lithospheric production at ridges
c. rates of lithospheric production and consumption are equal