- rock glacier
a mass of rock resembling a valley glacier that moves or is moved down a slope by its own weight or by the action of frost and interstitial ice.[1900-05]
* * *Tonguelike body of coarse rock fragments, found above the timberline on mountains, that moves slowly down a valley.The rock material usually has fallen from the valley walls and may contain large boulders; it resembles the material left at the end (terminus) of a true glacier. A rock glacier may be 100 ft (30 m) deep and nearly a mile (1.5 km) long.
* * *▪ geologytonguelike body of coarse rock fragments, found in high mountains above the timberline, that moves slowly down a valley. The rock material usually has fallen from the valley walls and may contain large boulders: it resembles the material left at the terminus of a true glacier. Interstitial ice usually occurs in the centre of rock glaciers. Where the ice approaches the terminus, it melts and releases the rock material, which then forms a steep talus slope. A rock glacier may be 30 metres (100 feet) deep and nearly 1 1/2 kilometres (about 1 mile) long.A rock glacier may have wavelike ridges on its surface that curve convexly downstream; these indicate flowage. Maximum movements observed exceed 150 centimetres (4 1/2 feet) per year. The method of movement is thought to be either flowage of the interstitial ice or creeping by frost action.
* * *
Look at other dictionaries:
Rock glacier — Rock glaciers are distinctive geomorphological landforms of blocky detritus which may extend outward and downslope from talus cones or from glaciers or the terminal moraines of glaciers. Their growth and formation is subject to some debate, with… … Wikipedia
rock glacier — noun : a rock stream having the general appearance of a valley glacier * * * a mass of rock resembling a valley glacier that moves or is moved down a slope by its own weight or by the action of frost and interstitial ice. [1900 05] … Useful english dictionary
rock glacier — A mass of poorly sorted angular boulders and fine material, with interstitial ice a meter or so below the surface (ice cemented) or containing a buried ice glacier (ice cored). It occurs in a permafrost area, and is derived from a cirque wall… … Glossary of landform and geologic terms
Glacier Rocheux — dans les monts Wrangell St Elias en Alaska. Un glacier rocheux est une masse de débris rocheux mélangés à de la glace se déplaçant à très faible vitesse (quelques centimètres à quelques mètres par an) sur un versant. Sur plusieurs milliers d… … Wikipédia en Français
Glacier rocheux — dans les monts Wrangell St Elias en Alaska. Un glacier rocheux est une masse de débris rocheux mélangés à de la glace se déplaçant à très faible vitesse (quelques centimètres à quelques mètres par an) sur un versant. Sur plusieurs milliers d… … Wikipédia en Français
glacier — glaciered, adj. /glay sheuhr/, n. an extended mass of ice formed from snow falling and accumulating over the years and moving very slowly, either descending from high mountains, as in valley glaciers, or moving outward from centers of… … Universalium
glacier — a) A large mass of ice formed, at least in part, on land by the compaction and recrystallization of snow, moving slowly by creep downslope or outward in all directions due to the stress of its own weight, and surviving from year to year.… … Glossary of landform and geologic terms
rock — rock1 rockless, adj. rocklike, adj. /rok/, n. 1. a large mass of stone forming a hill, cliff, promontory, or the like. 2. Geol. a. mineral matter of variable composition, consolidated or unconsolidated, assembled in masses or considerable… … Universalium
Rock — /rok/, n. a male given name. * * * I In geology, a naturally occurring and coherent aggregate of minerals. The three major classes of rock igneous, sedimentary, and metamorphic are based on the processes that formed them. These three classes are… … Universalium
rock stream — noun : a mass of rock fragments that moves or has moved slowly down a slope under its own weight usually aided by frost action and sometimes by interstitial ice compare rock glacier, rock river … Useful english dictionary