Morphotectonics
Morphotectonics ( from Ancient Greek: , "morphḗ" , "form"; and τεκτονικός , "tektonikos" , "pertaining to building" ) , or tectonic geomorphology , is a branch of geomorphology that studies how landforms are formed or affected by tectonic activity . 
<triplet> geomorphology <subj> landforms <obj> studies <triplet> landforms <subj> geomorphology <obj> studied by