Difference between pratt and airy about
isostasy
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Isostasy (Greek ísos "equal", stásis"standstill") is the state of gravitationalequilibrium between Earth's crust and mantlesuch that the crust "floats" at an elevation that depends on its thickness and density.
This concept is invoked to explain how different topographic heights can exist at Earth's surface. When a certain area of Earth's crust reaches the state of isostasy, it is said to be in isostatic equilibrium. Isostasy does not upset equilibrium but instead restores it (a negative feedback). It is generally accepted [1]that Earth is a dynamic system that responds to loads in many different ways. However, isostasy provides an important 'view' of the processes that are happening in areas that are experiencing vertical movement. Certain areas (such as the Himalayas) are not in isostatic equilibrium, which has forced researchers to identify other reasons to explain their topographic heights (in the case of the Himalayas, which are still rising, by proposing that their elevation is being supported by the force of the impacting Indian Plate; the Basin and Range Province of the Western US is another example of a region not in isostatic equilibrium
This concept is invoked to explain how different topographic heights can exist at Earth's surface. When a certain area of Earth's crust reaches the state of isostasy, it is said to be in isostatic equilibrium. Isostasy does not upset equilibrium but instead restores it (a negative feedback). It is generally accepted [1]that Earth is a dynamic system that responds to loads in many different ways. However, isostasy provides an important 'view' of the processes that are happening in areas that are experiencing vertical movement. Certain areas (such as the Himalayas) are not in isostatic equilibrium, which has forced researchers to identify other reasons to explain their topographic heights (in the case of the Himalayas, which are still rising, by proposing that their elevation is being supported by the force of the impacting Indian Plate; the Basin and Range Province of the Western US is another example of a region not in isostatic equilibrium
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Difference between Pratt isostasy and airy isostasy is described as follows:-
- Theory of isostasy in terms of Pratt's concept assumes lateral alteration occurring in density of rock over lithosphere whereas rock density is assumed to be almost equal over lithosphere in Airy s concept.
- It is believed that less dense crustal block convert into mountain and highly dense block convert into lowlands in Pratt's concept whereas Airy's concept describe different densities let mountain formation along with its roots being attached deeply with dense block below.
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Discuss the theory of isostasy as expressed by airy and pratt
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