gilgai การใช้

• The area around Gilgai is dotted with mine shafts that are unique in Australia.
• This heaving of the underlying material to the surface often creates a microrelief known as " gilgai ".
• Areas outside Australia that also have the necessary conditions for gilgai formation include central Russia and several parts of the United States.
• It can also result in a gently-rolling surface referred to as gilgai topography and in the dramatic soil inclusions known as slickensides.
• He returned to racing in October 2010 with a 10th placing in the Gilgai Stakes at Flemington; however, his retirement was announced shortly after.
• The movement of soil associated with gilgai formation damages infrastructure including building foundations, roads and railway lines and the undulations produced interfere with crop harvesting.
• 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.
• These soils are mainly black or dark gray and produce an irregular surface relief known as gilgai consisting of a series of small ridges standing 20 60 cm above circular depressions about 2 7 meters in diameter.
• Theories for the origin of Mima mounds include burrowing by pocket gophers; accumulation of wind-blown ( aeolian ) sediments around vegetation to form coppice dunes or nebkhas; seismic ground shaking by major earthquakes, though none have been observed to form Mima mounds; and shrinking and swelling of clays in hog-wallow or gilgai landforms.