<P> Erosion - related: </P> <Ul> <Li> Blowout: a depression created by wind erosion typically in either a partially vegetated sand dune ecosystem or dry soils (such as a post-glacial loess environment). </Li> <Li> Glacial valley: a depression carved by erosion by a glacier . </Li> <Li> River valley: a depression carved by fluvial erosion by a river . </Li> <Li> Area of subsidence caused by the collapse of an underlying structure such as sinkholes in karst terrain . </Li> <Li> Sink: an endorheic depression generally containing a persistent or intermittent (seasonal) lake, a salt flat (playa) or dry lake, or an ephemeral lake . </Li> </Ul> <Li> Blowout: a depression created by wind erosion typically in either a partially vegetated sand dune ecosystem or dry soils (such as a post-glacial loess environment). </Li> <Li> Glacial valley: a depression carved by erosion by a glacier . </Li>

This type of depression is created by wind erosion