crevvasses definition geology
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crevasse Full Definition of CREVASSE. 1. : a breach in a levee. 2. : a deep crevice or fissure (as in a glacier or the earth). a deep, narrow opening or crack in an area of thick ice or rock.
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Conglomerates and Breccias Conglomerates and Breccias A clastic rock made of particles larger than 2 mm in diameter is either a conglomerate or breccia. A conglomerate has rounded clasts while a breccia has angular clasts.Since water transport rapidly rounds large clasts, breccias normally indicate minimal transport. They commonly form as rock-fall and debris flow deposits along cliffs, and underground along faults or where caves collapse. conglomerate has rounded clasts while a breccia has angular clasts. Since water transport rapidly rounds large clasts, breccias normally indicate minimal transport. They commonly form as rock-fall and debris flow deposits along cliffs, and underground along faults or where caves collapse.
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- These soils are transitional to soil of the Gleysolic order. Where these features occur in the other subgroups of the Chernozemic order, a Gleyed prefix is placed before the name of the other subgroup (e.g. Gleyed Rego).
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- Split and merge into it. Answer by Paul Jones. Confidence votes 68.5K. Rockhound. A drop in the elevation of the surface of the land is called land subsidence, and can be caused by a collapse of underground mining shafts or naturally occurring underground cave system collapses, commonly called sinkholes.plit and merge into it. Answer by Paul Jones. Confidence votes 68.5K. Rockhound. A drop in the elevation of the surface of the land is called land subsidence, and can be caused by a collapse of underground mining shafts or naturally occurring underground cave system collapses, commonly called sinkholes.
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Landslide Landslide, also called landslip , the movement downslope of a mass of rock, debris, earth, or soil (soil being a mixture of earth and debris). Landslides occur when gravitational and other types of shear stresses within a slope exceed the shear strength (resistance to shearing) of the materials that form the slope. 1  Shear stresses can be built up within a slope by a number of processes.
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- Specific geologic features are almost always the result of the interaction between two or more surface and internal processes. A great example is the Grand Canyon, which was formed by the combined effects of tectonic uplift and stream erosion.eologic features are created by geologic processes. They typically result from the interactions between Earth's external processes (erosion and deposition) and internal processes (plate tectonics). They may be quite large (like a mountain range) or small (like the ripples in a streambed).
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Types of Folds With Photos A geological fold occurs when one or a stack of originally flat and planar surfaces, such as sedimentary strata, are bent or curved as a result of permanent deformation. Synsedimentary folds are those due to slumping of sedimentary material before it is lithified.
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Cardenas Basalt Cardenas Basalt. The Cardenas Basalt, also known as either the Cardenas Lava or Cardenas Lavas, is a rock formation that outcrops over an area of about 310 km2 (120 mi2) in the eastern Grand Canyon, Coconino County, Arizona. The lower part of the Cardenas Basalt forms granular talus slopes.
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Alluvial plain The Glossary of Landform and Geologic Terms, maintained by the United States' National Cooperative Soil Survey, defines an alluvial plain as a large assemblage of fluvial landforms (braided streams, terraces, etc.,) that form low gradient, regional ramps along the flanks of mountains and extend great distances from their sources (e.g., High Plains of North America) Use of alluvial plain as a general, informal term for a broad flood plain or a low-gradient delta is explicitly discouraged.
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Unconformities in Geology: Definition & Types Angular Unconformity. An angular unconformity is the result of erosion of tilted layers of sedimentary rock. The erosion surface is buried under younger, horizontal layers of sedimentary rock.
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Crenulation Crenulations form when an early planar fabric is overprinted by a later planar fabric. Crenulations form by recrystallisation of mica minerals during metamorphism. Micaceous minerals form planar surfaces known as foliations perpendicular to the principal stress field.
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- Olduvai Gorge is a steep-sided basin formed as a result of tectonic plate extension and the growth of the Ngorogoro Volcanic Highland to the east and south 35. The gorge is made up of 2 usually arid river branches: the larger, northern Main Gorge and the smaller, southern, Side Gorge.
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- There are several erosional features that form as a glacier both scours the rock and pulls pieces away. As rocks are pulled away from valley walls, a steep sided, bowl shaped depression forms at the top of a mountain, called a cirque.
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Geology A slump (geology) is a mass movement process of slope failure, in which a mass of rock or unconsolidated material drops along a concave slip surface. Slump units move downslope as an intact block (without internal deformation of the landslide material) and frequently rotate backwards.
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- Geology 101 Name(s): Lab 6: Structural geology and geological maps Structural geology is the study of the orientation and relationship of rock units. A rock unit is a lithologically similar layer or body of rock, and different rock units are given names referred to as formations.he expression of the axial plane on the surface of the land is the fold axis (or hinge line), which is usually a straight line. See the diagram below. There are two fold types: anticlines, in which the strata (layers) dip away from the fold axis; and synclines, in which the strata dip towards the fold axis.
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Mount Kilimanjaro Gorges are deep valleys between cliffs that are formed by erosion, and were formed from the plateau that can be found to the eastern side of the mountain. The cliffs form because harder rock strata that are resistant to erosion/weathering remain exposed on the valley walls.
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Clastic rock Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock. A clast is a fragment of geological detritus, chunks and smaller grains of rock broken off other rocks by physical weathering.Geologists use the term clastic with reference to sedimentary rocks as well as to particles in sediment transport whether in suspension or as bed load, and in sediment deposits.edimentary breccias are a type of clastic sedimentary rock which are composed of angular to subangular, randomly oriented clasts of other sedimentary rocks. They may form either. 1  in submarine debris flows, avalanches, mud flow or mass flow in an aqueous medium.
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Fold (geology) A fold in Slichowice nature reserve in Kielce, Poland (Variscan orogeny). Rainbow Basin Syncline near Barstow, California, United States. The term fold is used in geology when one or a stack of originally flat, level surfaces, such as sedimentary strata, are bent or curved as a result of pressure and high temperature. The basic cause is likely to be some aspect of plate tectonics.
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- Unconformities Unconformities are gaps in the geologic record that may indicate episodes of crustal deformation, erosion, and sea level variations. They are a feature of stratified rocks, and are therefore usually found in sediments (but may also occur in stratified volcanics).
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Definitions &Translations Freebase (5.00 / 1 vote) Rate this definition: Canyon. A canyon or gorge is a deep ravine between cliffs often carved from the landscape by a river. Rivers have a natural tendency to reach a baseline elevation, which is the same elevation as the body of water it will eventually drain into. This forms a canyon. Most canyons were formed by a process of long-time erosion from a plateau level. The cliffs form because harder rock strata that are resistant to erosion and weathering remain exposed on the valley walls. The word canyon is Spanish in origin. The word canyon is generally used in the United States, while the word gorge is more common in Europe and Oceania, though gorge and ravine are also used in some parts of the United States and Canada. The military derived word defile is occasionally used in the United Kingdom.
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- The Grand Canyon, Arizona, at the confluence of the Colorado and Little Colorado rivers. A canyon (Spanish: cañón) or gorge is a deep cleft between escarpments or cliffs resulting from the erosive activity of a river over geologic timescales.
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- 1 In the upper course, the river erodes the landscape and bends to avoid hard rock, creating interlocking spurs. 2  Rapids and waterfalls can form when it runs over alternating layers of hard and soft rock. 3  This is because soft rock erodes more easily than hard rock. In the upper course, the river erodes the landscape and bends to avoid hard rock, creating interlocking spurs. 2  Rapids and waterfalls can form when it runs over alternating layers of hard and soft rock. 3  This is because soft rock erodes more easily than hard rock.
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Definitions &Translations In geography and geology, a cliff is a significant vertical, or near vertical, rock exposure. Cliffs are formed as erosion landforms due to the processes of erosion and weathering that produce them. Cliffs are common on coasts, in mountainous areas, escarpments and along rivers.
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Schist HomeThe geology of AucklandMineralsRocksGlossary. IntroductionFeaturesIgneous rocksSedimentary rocksMetamorphic rocks. Schist is medium grade metamorphic rock, formed by the metamorphosis of mudstone / shale, or some types of igneous rock, to a higher degree than slate, i.e. it has been subjected to higher temperatures and pressures.
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Crevasses Crevasses are cracks that form in glaciers and can range from just a few inches across to over 40 feet (12 m.), and can be over 100 feet (30.5 m.) deep.
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- Inceptisols form also in colluvium at the base of steep slopes. Processes to form colluvium are mass movement, soil creep (slow mass movement), and deposition. Due to the hillslope processes and weathering morphological features are being formed and destroyed continuously.