It is the deformation of the Earth's crust by such geologic processes as volcanism, faulting, and folding.
Continental drift seafloor spreading plate tectonic ayan na ha .... nilagyan ko na ng answer mga bobo kayo ............JOKE lng xD ..
theory of diASTROPHISMare:Isostacy's theorycontraction theoryconvection theorycontinental drift theoryexpansion theory