conditions, processes, features, phenomena, zone, environments, environment, regions, areas, deposits, climate, activity, geomorphology, landforms, structures, area, origin, landscapes, forms, action, climates, zones, sediments, region, solifluction, involutions, landscape, weathering, erosion, lakes, cycle, steppe, effects, tundra, slopes, loess, europe, regime, steppes, morphology, research, formations, belt, terraces, soils, periods, vegetation, ground, rivers, phases, domain, morphogenesis, feature, phenomenon, modification, deposit, basins, episodes, valleys, debris, streams, disturbance, wasting, regimes, wedges, evolution, mudslides, setting, circles, winds, faunas, formation, plains, valley, gravels, flora, sands, varvites, drift, cracks, slope, belts, accumulation, realm, terrain, geomorphologists