Depression (geology)

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Depression (geology)

A Blowout is a depression created by Wind Erosion typically in either a Desert Sand or post-glacial Loess environment.

A Graben is a down dropped and typically linear depression or basin created by Rifting in a region under tensional tectonic forces.

An Impact Crater is a depression created by an impact such as a Meteorite crater.

A depression may be an area of Subsidence caused by the collapse of an underlying structure. Examples include Sinkhole s in Karst Topography , Caldera s or Maar s in volcanic areas, or Kettles in Glaciated terraines.

A depression may be a region of tectonic downwarping typically associated with a Subduction Zone and Island Arc . Fore-arc and back-arc Sedimentary Basin s fill with Sediment from an adjacent island arc, or from continental Volcanism and uplift.

A depression may result from the weight of overlying material such as an ice sheet during continental Glaciation which is subsequently removed resulting in a basin which slowly Rebounds .

A depression may be a Pothole - either a simple roadway depression or a Fluvial erosional depression in a River Streambed , or area affected by coastal water currents.

One of many impressive depressions is the Great Rift Valley of East Africa . Perhaps even more impressive is the Atlantic Ocean basin.