ice wedge वाक्य
उदाहरण वाक्य
मोबाइल
- As they accumulated between 170, 000 and 120, 000 years ago, ice wedge polygons formed in these sediments as the result of extremely cold and dry conditions.
- Patterned ground-large polygonal ground patterns and ice wedges caused by frost over a long period of time are common throughout the region except for areas of solid bedrock.
- These depressions formed as the result of the thawing of ice wedges and other permafrost during the Late Pleistocene-Holocene transition about 12, 000 to 10, 000 years ago.
- Ice wedges form in a pre-existing geological substrate and were first described in 1919 . Popov, 1962; Shumskiy and Vtyurin, 1966; Pewe, 1966b; French et al ., 1982; Michel, 1990
- They contain ice wedge polygon systems that formed during the Early Weichselian stadial, about 100, 000 to 50, 000 years ago, as the result of extremely cold and dry conditions.
- Eemian lake sediments fill depressions, i . e . ice wedge casts and thermokarst lakes, which developed by the surficial thawing during Eemian interglacial climates of Saalian ice-wedges and other permafrost.
- Several of the levels are without hominin remains, or have been disturbed primarily through cryoturbations ice wedging, there are some stratigraphically separated hominin levels at Vindija Cave associated with humans and Neanderthals.
- New ice wedge polygon systems later formed in these sediments during the Late Holocene as result of pronounced climatic cooling, which only recently has reversed in the last couple of hundred years.
- Once temperatures reach " 17 degrees Celsius or lower, the ice that has already formed acts like a solid and expands to form cracks in the surface known as ice wedges.
- This most commonly occurs in northern subarctic taiga forests of Black Spruce ( " Picea mariana " ) under which discontinuous permafrost or ice wedges have melted, causing trees to tilt at various angles.
- The cause of cryoturbation lies in the way in which the repeated freezing of the soil during autumn causes the formation of ice wedges at the most easily erodible parts of the parent rock.
- This paleosol has been largely modified by periglacial processes and development of ice wedges periodically during the Pleistocene These deeply weathered sediments are unfossiliferous and characterized by the presence of weathering products like kaolinite and montmorillonite.
- An "'ice wedge "'is a crack in the ground formed by a narrow or thin piece of ice that measures up to 3 4 meters in length at ground level and extends downwards into the ground up to several meters.
- Terms synonymous with clastic dike include : " clastic intrusion, sandstone dike, fissure fill, soft-sediment deformation, fluid escape structure, seismite, injectite, liquefaction feature, neptunian dike ( passive fissure fills ), paleoseismic indicator, pseudo ice wedge cast, sedimentary insertion, sheeted clastic dike, synsedimentary filling, tension fracture, hydraulic injection dike ", and " tempestite ".
- "' Periglaciation "'( adjective : " periglacial, " also referring to places at the edges of geomorphic processes that result from seasonal thawing of snow in areas of permafrost, the runoff from which refreezes in ice wedges and other structures . " Periglacial " suggests an environment located on the margin of past glaciers.
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