patterned ground वाक्य
उदाहरण वाक्य
मोबाइल
- A permanent layer of permafrost may be up to one kilometre thick, and lies under a shallow stratum of waterlogged active soils that cyclically freeze and thaw, creating patterned ground.
- Gilgais are structurally similar to the patterned ground of frigid regions, however periglacial soil polygons are formed by repeated freeze-thaw cycles rather than the soil moisture cycles that create gilgai.
- Typically found in remote regions of the Arctic, Antarctica, and the Australian outback, but also found anywhere that freezing and thawing of soil alternate; patterned ground has also been observed on Mars.
- This may link to the patterned ground features of stone nets becoming elongated by gradient resulting in stone stripes as seen in modern periglacial environment and in relic locations such as Dartmoor.
- This form of patterned ground is generally a terrace-like feature that has a border of either larger stones or vegetation on the downslope side, and can consist of either sorted or unsorted material.
- The mechanism of the formation of patterned ground had long puzzled scientists, but the introduction of computer-generated geological models in the past 20 years has allowed scientists to relate it to frost heaving, the expansion that occurs when wet, fine-grained, and porous soils freeze.
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