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- Q1672567 subject Q7163803.
- Q1672567 abstract "A dry valley may be developed on many kinds of permeable rock, such as limestone and chalk, or sandy terrains that do not regularly sustain surface water flow. Such valleys do not hold surface water because it sinks into the permeable bedrock.There are many examples of chalk dry valleys along the North and South Downs in southern England. Notably the National Trust-owned Devil's Dyke near Brighton covers some 200 acres (0.81 km2) of downland scarp, and includes the deepest dry valley in the world - created when melting water eroded the chalk downland to the permafrost layer after the last ice age. The three-quarter mile long curved dry valley is around 700 feet (210 m) in height and attracts tourists with its views of Sussex, Hampshire and Kent.Other examples include the Alkham Valley near Dover, and the Hartley Bottom and Fawkham valleys near Dartford in north Kent.There are many examples of limestone dry valleys in the Peak District and the Yorkshire Wolds. A notable example is the valley of the River Manifold which is dry, except in spate, from Wetton south for several miles.Many hypotheses have been advanced to explain dry valley development. Some may have developed during periods of higher water table, others in periglacial conditions during which normally permeable bedrock would have been made impervious by permafrost, thus allowing flowing water to erode it.".
- Q1672567 thumbnail Dry_Valley_Near_Rackham_Hill_-_geograph.org.uk_-_548019.jpg?width=300.
- Q1672567 wikiPageWikiLink Q131491.
- Q1672567 wikiPageWikiLink Q1330811.
- Q1672567 wikiPageWikiLink Q1434835.
- Q1672567 wikiPageWikiLink Q179224.
- Q1672567 wikiPageWikiLink Q179918.
- Q1672567 wikiPageWikiLink Q183670.
- Q1672567 wikiPageWikiLink Q2000634.
- Q1672567 wikiPageWikiLink Q21.
- Q1672567 wikiPageWikiLink Q2215481.
- Q1672567 wikiPageWikiLink Q23757.
- Q1672567 wikiPageWikiLink Q2600864.
- Q1672567 wikiPageWikiLink Q4727694.
- Q1672567 wikiPageWikiLink Q49367.
- Q1672567 wikiPageWikiLink Q5267123.
- Q1672567 wikiPageWikiLink Q571433.
- Q1672567 wikiPageWikiLink Q584108.
- Q1672567 wikiPageWikiLink Q7163803.
- Q1672567 wikiPageWikiLink Q7337619.
- Q1672567 wikiPageWikiLink Q858775.
- Q1672567 comment "A dry valley may be developed on many kinds of permeable rock, such as limestone and chalk, or sandy terrains that do not regularly sustain surface water flow. Such valleys do not hold surface water because it sinks into the permeable bedrock.There are many examples of chalk dry valleys along the North and South Downs in southern England.".
- Q1672567 label "Dry valley".
- Q1672567 depiction Dry_Valley_Near_Rackham_Hill_-_geograph.org.uk_-_548019.jpg.