downcutting

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• Downcutting — Several stages of downcutting by the San Juan River in Utah can be identified in this 1927 photo. Remnants of former floodplains stand as terraces above the river s modern level. Downcutting, also called erosional downcutting or downward erosion… …   Wikipedia

• river — river1 riverless, adj. riverlike, adj. /riv euhr/, n. 1. a natural stream of water of fairly large size flowing in a definite course or channel or series of diverging and converging channels. 2. a similar stream of something other than water: a… …   Universalium

• Stream terrace — Stream terraces are relict features, such as floodplains, from periods when a stream was flowing at a higher elevation and has downcut to a lower elevation. Stream terraces often appear as plateaus on existing valley walls and indicate earlier… …   Wikipedia

• cave — cavelike, adj. /kayv/, n., v., caved, caving. n. 1. a hollow in the earth, esp. one opening more or less horizontally into a hill, mountain, etc. 2. a storage cellar, esp. for wine. 3. Eng. Hist. a secession, or a group of seceders, from a… …   Universalium

• Rejuvenation (river) — A river is said to be rejuvenated when the base level that it is flowing down to is lowered. This can happen by uplift of land, or by a sea or lake that it is flowing into becoming lower. That makes the river suddenly start eroding its bed… …   Wikipedia

• canyon passage —    1. A tubular passage (cave) that is formed by underground streams following gently tilted beddingplane partings or fractures and are eroding channels downward through the rock.    Their ceiling heights are greater than their widths. They are… …   Lexicon of Cave and Karst Terminology

• Carriger Creek (Sonoma County, California) — Geobox|River name = Carriger Creek native name = other name = category = stream etymology = nickname = image caption = country = United States state = California region = Sonoma County district = municipality = parent = tributary right = Felder… …   Wikipedia

• Himalayas — Himalayan, adj. /him euh lay euhz, hi mahl yeuhz/, n. the, a mountain range extending about 1500 mi. (2400 km) along the border between India and Tibet. Highest peak, Mt. Everest, 29,028 ft. (8848 m). Also called the Himalaya, Himalaya Mountains …   Universalium

• valley — valleylike, adj. /val ee/, n., pl. valleys. 1. an elongated depression between uplands, hills, or mountains, esp. one following the course of a stream. 2. an extensive, more or less flat, and relatively low region drained by a great river system …   Universalium

• V-shaped valley —    A valley having a pronounced cross profile suggesting the form of the letter V , characterized by steep sides and short tributaries; specifically a narrow valley resulting from downcutting by a stream. The V becomes broader as the downcutting… …   Glossary of landform and geologic terms

• Valley — In geology, a valley (also called a vale, dale, glen or strath and near or in Appalachia, a draw) is a depression with predominant extent in one direction. A very deep river valley may be called a canyon or gorge. The terms U shaped and V shaped… …   Wikipedia