[Solved] An orogeny is: A) the formation of mountains or the time period during which tectonic activity causes deformation and forms mountains B) the subsidence of a continent under the weight of continental glaciation during an ice age C) a cycle of erosion and deposition during which large areas of horizontal sedimentary rock are created D) a unit of geologic time which is longer than an epoch, but shorter than a period Obsessions: null Stress: null Reliability: null Validity: null