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Depression (geology)

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Title: Depression (geology)  
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Subject: Nadir (topography), Yunnan–Guizhou Plateau, List of elevation extremes by country, Carmen Basin, Guaymas Basin
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Depression (geology)

A watering hole is a depression where water collects and animals come to drink

A depression in geology is a landform sunken or depressed below the surrounding area. Depressions may be formed by various mechanisms.

Erosion-related:

Glaciation-related:

  • A basin formed by glaciation - depressed by the weight of the ice sheet resulting in post-glacial rebound after the ice melts (the area adjacent to the ice sheet may be pulled down to create a peripheral depression.)[2]
  • Kettle: a shallow, sediment-filled body of water formed by melting glacial remnants in terminal moraine.[3]

Impact-related:

Sedimentary-related:

  • Sedimentary basin: In sedimentology, an area thickly filled with sediment[1] in which the weight of the sediment further depresses the floor of the basin.

Structural or tectonic-related:

Volcanism-related:

  • Caldera: a volcanic depression resulting from collapse following a volcanic eruption.[4]
  • Pit crater: a volcanic depression smaller than a caldera formed by a sinking, or caving in, of the ground surface lying over a void.
  • Maar: a depression resulting from phreatomagmatic eruption or diatreme explosion.

See also

References

  1. ^ a b "Dictionary of Geologic Terms - B". geotech.org. Retrieved 2006-08-25. 
  2. ^ "Glossary of Important Terms in Glacial Geology - Peripheral Depression". Montana State University. 1999. Retrieved 2006-08-25.  Cites American Geological Institute's Glossary of Geology (3rd edition, revised in 1987).
  3. ^ "Dictionary of Geologic Terms - K". geotech.org. Retrieved 2006-08-26. 
  4. ^ "Dictionary of Geologic Terms - C". geotech.org. Retrieved 2006-08-25. 
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