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GE
gravel, petrology, continental rifting, subduction, strata, limestone, plutonic, ocean basins, rudy, eruptions, rhyolite, mantle convection, crust, mineral resources, mid-oceanic ridge, magmatic arc, epoch, faulting, fossil fuels, transform plate boundaries, economic geology, coal, spreadnig centers, intrusion, oceanic trenches, continental crust, geologic time scale, hydrogeology, fault, benioff zone, gneiss, marble