What is Pratt’s hypothesis of Isostasy?
An explanation of this phenomenon was given by John Pratt who was Archdeacon of Calcutta. Pratt’s hypothesis of isostacy proposed that topography is produced by crustal blocks with varying density, that terminate at a uniform depth. Clarence Dutton was the scientist who coined the term isostasy, and he also studied the idea that the Earth’s crust naturally seeks equilibrium.The term isostasy was first proposed by an American geologist Clarence Dutton in 1889 to indicate the state of balance which exists between large upstanding areas of the Earth’s surface, mountain ranges and plateaus.Isostasy is a principle that describes the vertical positioning of segments of the earth’s lithosphere relative to the elevation of the land and depth to the top of the asthenosphere. It is, in effect, a restatement of Archimedes’ principle or an application of that principle to the outer layers of the earth.Dutton’s concept, also known as the principle of isostasy, was a groundbreaking contribution to the field of geology in 1889. The concept explained how the Earth’s crust and upper mantle behave like a fluid and adjust their elevation in response to changes in mass distribution to maintain a state of equilibrium.
Who first used isostasy?
The term isostasy was first proposed by an American geologist Clarence Dutton in 1889 to indicate the state of balance which exists between large upstanding areas of the Earth’s surface, mountain ranges and plateaus. Isostasy is the rising or settling of a portion of the Earth’s lithosphere that occurs when weight is removed or added in order to maintain equilibrium between buoyancy forces that push the lithosphere upward, and gravity forces that pull the lithosphere downward.Isostasy refers to the state of equilibrium in which different parts of the Earth’s crust float at heights determined by their thickness and density. It can be compared to icebergs floating in water: thicker or lighter portions float higher, while denser or thinner portions float lower.
What is Pratt’s theory of isostasy?
An explanation of this phenomenon was given by John Pratt who was Archdeacon of Calcutta. Pratt’s hypothesis of isostacy proposed that topography is produced by crustal blocks with varying density, that terminate at a uniform depth. The Pratt hypothesis, developed by John Henry Pratt, English mathematician and Anglican missionary, supposes that Earth’s crust has a uniform thickness below sea level with its base everywhere supporting an equal weight per unit area at a depth of compensation.