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Vallis or valles / ˈ v æ l ɪ s / (plural valles / ˈ v æ l iː z /) [1] is the Latin word for valley.It is used in planetary geology to name landform features on other planets.. Scientists used vallis for old river valleys they discovered when they sent the first probes to Mars.
The valley of Halikko River in Halikko, Finland Valley of Palakaria river springing from Vitosha Mountain, seen in the background, in Bulgaria. The development of a river valley is affected by the character of the bedrock over which the river or stream flows, the elevational difference between its top and bottom, and indeed the climate.
Incised valleys are mountain-valley-like features that commonly result from river down cutting into coastal plains and continental shelves in response to marine regression. They are the key evidence to identify sequence boundary on seismic profiles and outcrops.
Many of the terms are not restricted to refer to features of the planet Earth, and can be used to describe surface features of other planets and similar objects in the Universe. Examples are mountains, hills, polar caps, and valleys, which are found on all of the terrestrial planets. The scientific study of landforms is known as geomorphology.
This glossary of geography terms is a list of definitions of terms and concepts used in geography and related fields, including Earth science, oceanography, cartography, and human geography, as well as those describing spatial dimension, topographical features, natural resources, and the collection, analysis, and visualization of geographic data.
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The word thalweg is of 19th-century German origin. The German word Thalweg (modern spelling Talweg) is a compound noun that is built from the German elements Thal (since Duden's orthography reform of 1901 written Tal) meaning valley (cognate with dale in English), and Weg, meaning way.
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