50 Important Isostasy Short Questions and Answers part 1
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50 Important Isostasy Short Questions and Answers
Geoinfopedia :
Hello friends welcome in this blog. Here we discuss about 50 important isostasy short question and answer for your competitive exam.
This question mainly taken from isostasy chapter in geography. If you are preparing 44 WBCS exam or UPSC exam or NTA NET exam, or SET exam. You can read this questions.
Here all questions are very important for your exam.
Q ➤ 1. Q: What is isostasy?Ans ➤ A: Isostasy is the equilibrium in the Earth's crust where the buoyant force of the lithosphere is balanced by the gravitational force.
Q ➤ 2. Q: Who proposed the concept of isostasy?Ans ➤ A: The concept of isostasy was proposed by George Airy in the 19th century.
Q ➤ 3. Q: What causes isostatic adjustments?Ans ➤ A: Isostatic adjustments are caused by variations in crustal thickness and density.
Q ➤ 4. Q: Define isostatic compensation.Ans ➤ A: Isostatic compensation refers to the vertical movements of the Earth's crust to achieve equilibrium.
Q ➤ 5. Q: What are the two types of isostatic adjustments?Ans ➤ A: There are two types: Airy isostasy and Pratt isostasy.
Q ➤ 6. Q: Explain Airy isostasy.Ans ➤ A: Airy isostasy states that higher topography is supported by a deeper root of lower density rock beneath it.
Q ➤ 7. Q: Explain Pratt isostasy.Ans ➤ A: Pratt isostasy suggests that differences in density of the crust and mantle cause variations in elevation.
Q ➤ 8. Q: What is eustatic sea-level change?Ans ➤ A: Eustatic sea-level change refers to global changes in sea level due to factors like melting ice and thermal expansion.
Q ➤ 9. Q: What is glacial isostatic adjustment?Ans ➤ A: Glacial isostatic adjustment is the rebound of the crust after the melting of ice sheets.
Q ➤ 10. Q: How do volcanic islands demonstrate isostasy?Ans ➤ A: Volcanic islands rise from the ocean floor due to the buoyant force of magma, exhibiting isostatic equilibrium.
Q ➤ 11. Q: Explain the term "isostatic depression."Ans ➤ A: Isostatic depression refers to the sinking of the crust caused by the removal of material, like melting glaciers.
Q ➤ 12. Q: Why do continents experience post-glacial rebound?Ans ➤ A: Continents experience post-glacial rebound due to the removal of the weight of ice sheets.
Q ➤ 13. Q: What is the role of isostasy in mountain formation?Ans ➤ A: Isostasy explains the vertical movement of Earth's crust in response to the accumulation or erosion of material during mountain formation.
Q ➤ 14. Q: How does isostasy influence crustal deformation?Ans ➤ A: Isostasy determines the balance between the forces causing crustal uplift and subsidence.
Q ➤ 15. Q: What is the connection between isostasy and Earth's gravity?Ans ➤ A: Isostasy explains how the equilibrium between buoyancy and gravity affects the Earth's crust.
Q ➤ 16. Q: What is the principle of isostatic equilibrium?Ans ➤ A: The principle of isostatic equilibrium states that the Earth's crust will adjust to maintain a state of balance.
Q ➤ 17. Q: How does isostasy relate to the Mohorovičić discontinuity?Ans ➤ A: The Mohorovičić discontinuity marks the boundary between the Earth's crust and the mantle, influencing isostatic adjustments.
Q ➤ 18. Q: What is the role of isostasy in the formation of rift valleys?Ans ➤ A: Isostatic adjustments lead to the sinking of the crust, forming rift valleys in divergent plate boundaries.
Q ➤ 19. Q: How does isostasy affect the stability of continents?Ans ➤ A: Isostasy helps maintain the stability of continents by balancing the forces that cause uplift and subsidence.
Q ➤ 20. Q: Explain the concept of local isostasy.Ans ➤ A: Local isostasy considers variations in density and thickness of Earth's crust on a smaller scale.
Q ➤ 21. Q: What is the relationship between isostasy and erosion?Ans ➤ A: Erosion can lead to isostatic uplift as the removal of material reduces the gravitational load on the crust.
Q ➤ 22. Q: How does isostasy explain the concept of isostatic rebound?Ans ➤ A: Isostatic rebound occurs as the Earth's crust rises after the removal of heavy ice sheets, readjusting to equilibrium.
Q ➤ 23. Q: Why do oceanic plates generally exhibit a lower elevation than continental plates?Ans ➤ A: Oceanic plates have a higher density, causing them to sink deeper into the mantle due to isostatic adjustments.
Q ➤ 24. Q: What role does isostasy play in the formation of mid-ocean ridges?Ans ➤ A: Isostatic adjustments cause the uplift of material along mid-ocean ridges, leading to the formation of underwater mountain ranges.
Q ➤ 25. Q: How does isostasy contribute to the subsidence of sedimentary basins?Ans ➤ A: As sediment accumulates in a basin, the crust subsides under the increased weight, leading to isostatic adjustments.
Q ➤ 26. Q: Explain the term "compensational subsidence."Ans ➤ A: Compensational subsidence refers to the downward movement of the crust due to the loading of sediment.
Q ➤ 27. Q: What is the concept of flexural rigidity in isostasy?Ans ➤ A: Flexural rigidity refers to the resistance of the lithosphere to bending and is a factor in isostatic adjustments.
Q ➤ 28. Q: How does the principle of isostasy explain the formation of ocean trenches?Ans ➤ A: Ocean trenches form as denser oceanic plates sink into the mantle, causing isostatic adjustments in the crust.
Q ➤ 29. Q: What causes the uplift of mountain ranges over geologic time?Ans ➤ A: The uplift of mountain ranges over time is caused by isostatic adjustments due to tectonic forces and erosion.
Q ➤ 30. Q: How does isostasy relate to the concept of gravitational potential energy?Ans ➤ A: Isostasy involves the balancing of gravitational potential energy between different layers of the Earth's crust.
Q ➤ 31. Q: Explain how volcanic activity is influenced by isostatic adjustments.Ans ➤ A: Volcanic activity can be influenced by the movement of magma and changes in pressure due to isostatic adjustments.
Q ➤ 32. Q: What is the role of isostasy in the formation of continental shelves?Ans ➤ A: Isostatic adjustments contribute to the shaping of continental shelves through the accumulation of sediments.
Q ➤ 33. Q: How does isostasy affect the stability of continental crust?Ans ➤ A: Isostasy helps maintain the stability of continental crust by equalizing forces of uplift and subsidence.
Q ➤ 34. Q: What is the relationship between isostasy and the Earth's lithospheric plates?Ans ➤ A: Isostasy influences the vertical movement of the lithospheric plates in response to changes in weight distribution.
Q ➤ 35. Q: How does isostasy explain the formation of ocean basins?Ans ➤ A: Ocean basins form as oceanic plates subside into the mantle due to isostatic adjustments.
Q ➤ 36. Q: Explain the term "isostatic disequilibrium."Ans ➤ A: Isostatic disequilibrium occurs when the Earth's crust is not in balance due to changes in loading or unloading.
Q ➤ 37. Q: How does isostasy relate to the concept of thermal buoyancy?Ans ➤ A: Isostasy involves thermal buoyancy as warmer, less dense material tends to rise and colder, denser material tends to sink.
Q ➤ 38. Q: What are some examples of isostatic adjustments in coastal regions?Ans ➤ A: Examples include the sinking of coastlines due to the weight of sediment accumulation and the rebound of land after the melting of glaciers.
Q ➤ 39. Q: How does isostasy contribute to the formation of fault-block mountains?Ans ➤ A: Isostatic adjustments can lead to the uplift of one block of crust and the subsidence of adjacent blocks, creating fault-block mountains.
Q ➤ 40. Q: Explain the concept of dynamic isostasy.Ans ➤ A: Dynamic isostasy refers to the vertical movement of the Earth's crust due to the flow of material in the mantle.
Q ➤ 41. Q: What is the role of isostasy in the formation of continental rifts?Ans ➤ A: Isostatic adjustments can lead to the sinking of the crust and the formation of rift valleys in continental rift zones.
Q ➤ 42. Q: How does isostasy influence the formation of sedimentary basins?Ans ➤ A: Isostatic adjustments play a role in the subsidence and uplift of sedimentary basins, affecting their shape and depth.
Q ➤ 43. Q: What are the implications of isostatic adjustments for sea-level change?Ans ➤ A: Isostatic adjustments can lead to local variations in sea level due to the movement of the Earth's crust.
Q ➤ 44. Q: How does isostasy explain the phenomenon of glacial rebound?Ans ➤ A: Glacial rebound occurs when the Earth's crust rises after the melting of ice sheets, as it readjusts to a state of equilibrium.
Q ➤ 45. Q: Explain how isostasy contributes to the formation of oceanic islands.Ans ➤ A: Isostatic adjustments can cause the oceanic crust to rise, leading to the formation of volcanic islands.
Q ➤ 46. Q: What is the concept of hydrostatic equilibrium in isostasy?Ans ➤ A: Hydrostatic equilibrium refers to the balance between the weight of the Earth's crust and the pressure of underlying material.
Q ➤ 47. Q: How does isostasy play a role in the subsidence of sedimentary rocks?Ans ➤ A: Isostatic adjustments can lead to the subsidence of sedimentary rocks as they accumulate and increase the load on the crust.
Q ➤ 48. Q: Explain the term "isostatic rebound" in the context of earthquake aftermath.Ans ➤ A: Isostatic rebound refers to the uplift of the Earth's crust after an earthquake due to the release of pressure.
Q ➤ 49. Q: What is the connection between isostasy and the formation of oceanic trenches?Ans ➤ A: Isostatic adjustments contribute to the formation of oceanic trenches as the dense oceanic crust sinks into the mantle.
Q ➤ 50. Q: How does isostasy influence the shape and elevation of continents?Ans ➤ A: Isostatic adjustments affect the shape and elevation of continents by balancing the forces of uplift and subsidence over geological time.
