More than a billion years ago, the continent of africa hit north america, generating enormous pressure and heat while pushing up the blue ridge mountains to a height of 30,000 feet. most of these mountains have since been worn away by wind, rain, and the growth of living organisms. the order of the rock cycle in this case is best described as a) igneous, sedimentary. b) metamorphic, igneous. c) igneous, metamorphic. d) metamorphic, sedimentary.