Also known as climatomorphology, this is the association of types of landform with different climates, as when the processes in particular climatic zones form specific landforms e.g. periglacial landforms in tundra climates. Many classifications have been proposed, but the thesis is a controversial one, partly because there seems not to be a consistent link between climate and dominant geomorphological process(es), and partly because climate is only one factor in the development of landforms.