WErosion
WAbrasion (geology)
WBank erosion
WBase level
WBioerosion
WBlowout (geomorphology)
WBridge scour
WCliffed coast
WDowncutting
WExfoliation joint
WHeadward erosion
WHydraulic action
WMeander
WPlucking (glaciation)
WRiver bank failure
WRiver incision
WSand engine
WScarp retreat
WStream load