Asthenosphere example sentences

"Asthenosphere" Example Sentences

1. The asthenosphere is the semi-molten layer of the Earth's mantle below the lithosphere.
2. The asthenosphere lies between the lithosphere and the mesosphere.
3. The asthenosphere is composed of hot, weak rocks that flow slowly over geologic time.
4. The lithosphere 'floats' on the denser, hotter asthenosphere.
5. The asthenosphere starts around 50 to 100 kilometers below Earth's surface.
6. Mantle convection occurs within the asthenosphere.
7. The semi-molten nature of the asthenosphere allows the lithospheric plates to move.
8. The asthenosphere is thought to have a low viscosity and shear strength.
9. Hotter mantle material upwells within the asthenosphere.
10. The boundary between the lithosphere and asthenosphere is called the lithosphere-asthenosphere boundary (LAB).
11. Seismic shear waves propagate more slowly within the asthenosphere.
12. Asthenospheric flow drives plate tectonics at Earth's surface.
13. Oceanic lithosphere is generally formed within the asthenosphere at mid-ocean ridges.
14. The asthenosphere is thought to responsible for hotspot volcanoes.
15. Heat from the asthenosphere causes the lithosphere to weaken over time.
16. Asthenospheric material can be dragged down into the deeper mantle at subduction zones.
17. The temperature of the asthenosphere is around 1,000 to 1,350 degrees Celsius.
18. Deformation within the asthenosphere pushes and pulls the lithospheric plates.
19. Magma rises through the asthenosphere, driven by mantle convection.
20. The properties of the asthenosphere create plastic flow within the mantle.
21. The composition of the asthenosphere is similar to that of the rest of the mantle.
22. The base of the asthenosphere marks a transition to stiffer mantle material.
23. Olivine is the main mineral within the asthenosphere.
24. Geologists study the asthenosphere to understand plate tectonics and mantle dynamics.
25. Mantle plumes originate within the asthenosphere.
26. Geophysical models attempt to characterize the properties of the asthenosphere.
27. Isostatic rebound occurs after removal of lithosphere into the asthenosphere.
28. Asthenospheric convection helps drive plate tectonics at Earth's surface.
29. Convection within the asthenosphere transfers heat from Earth's interior.
30. Asthenospheric flow occurs at rates of centimeters per year.
31. Extension of the lithosphere thins it and allows more asthenospheric influence.
32. Lithospheric plates move independently of the underlying asthenosphere.
33. The asthenosphere exists in a semi-molten state due to high temperatures.
34. Heat transfer from the asthenosphere controls how long lithospheric plates survive.
35. Compositional changes within the asthenosphere may influence volcanic activity.
36. Asthenospheric upwelling originates from the lower mantle.
37. Asthenospheric flow controls the motion of lithospheric plates.
38. Mantle plumes form above upwellings within the asthenosphere.
39. The viscous properties of the asthenosphere depend on temperature, pressure and composition.
40. Asthenospheric deformation helps accommodate lithospheric stresses.
41. Asthenospheric material flows around chunks of subducted lithosphere.
42. The viscosity of the asthenosphere varies between 1018 and 1021 Pa·s.
43. Geophysical monitoring tracks asthenospheric flow beneath lithospheric plates.
44. Folds and steep dips in rock record deformation within ancient asthenospheres.
45. Basaltic magmas form within the hot asthenosphere.
46. Mantle convection cells circulate throughout the depth of the asthenosphere.
47. Geophysical methods are used to probe the properties of the asthenosphere.
48. The vertical component of plate tectonics is driven by asthenospheric upwelling.
49. Mantle plumes originate with upwellings within the asthenosphere.
50. Asthenospheric flow controls how lithospheric plates move and deform.
51. Compressional forces at plate boundaries deform the underlying asthenosphere.
52. Hotter asthenosphere melts more easily and flows at lower viscosities.
53. Asthenospheric flow shapes the locations of volcanic hotspots.
54. Hotter asthenosphere decreases the rigidity of overriding lithospheric plates.
55. Plate tectonics results from interactions between the lithosphere and asthenosphere.
56. Asthenospheric upwellings rise beneath regions of thinned lithosphere.
57. The ductile properties of the asthenosphere allow it to deform under stress.
58. Deep earthquakes occur where subducting lithosphere penetrates the asthenosphere.
59. Asthenospheric flow drives plate motions and mountain building at Earth's surface.
60. Asthenospheric convection circulates heat from Earth's interior.

Common Phases

1. The asthenosphere lies below the lithosphere and allows the tectonic plates to move around.
2. Mantle convection occurs within the asthenosphere and helps drive plate tectonics.
3. The boundary between the lithosphere and asthenosphere is where plate tectonics activity occurs.
4. Magma rises from the asthenosphere into the lithosphere, creating new crust.
5. Hot spot volcanoes form when magma rises through the asthenosphere and then erupts on Earth's surface.
6. The Hawaiian Islands formed as the Pacific Plate moved over a hot spot originating in the asthenosphere.
7. The asthenosphere is composed mostly of soft and weak mantle rocks that deform easily under stress.
8. The asthenosphere is hot, partially molten, and able to flow like a liquid over geologic time scales.
9. Shear waves cannot propagate through the asthenosphere due to its ductile and weak nature.
10. The density of the asthenosphere is slightly less than the surrounding mantle.
11. The behavior of the asthenosphere helps explain plate tectonics and the movement of continents.
12. The oozing flow of the asthenosphere allows the plates to "float" above it.
13. The elastic lithosphere contrasts sharply with the weak asthenosphere below.
14. The columbian flood basalts erupted as magma rose through the asthenosphere.
15. Seismic tomography images have provided insights into the structure and composition of the asthenosphere.
16. The temperature, mineralogy, and partial melt content of the asthenosphere all vary with depth.
17. The asthenosphere extends from around 60 to 200 kilometers deep below Earth's surface.
18. Stresses applied at the surface are transmitted into the lithosphere but dissipate within the asthenosphere.
19. Shear forces deform the asthenosphere, allowing it to flow and carry the overlying plates with it.
20. Magmas trapped within the hot asthenosphere differentiate into basaltic and picritic compositions.
21. The viscosity of the asthenosphere drops rapidly with increasing temperature.
22. GPS data provides information about relative movements of plates sliding over the asthenosphere.
23. Flexure of lithosphere above ascending plumes in the asthenosphere can cause changes in Earth's gravity field.
24. The asthenosphere may contain over 1% partial melt, allowing it to deform and flow like a fluid.
25. Mantle plumes often stem from the upper part of the asthenosphere.
26. The base of the asthenosphere marks an increase in velocity of seismic shear waves.
27. Hot spot tracks record the movement of plates over stationary upwellings from the asthenosphere.
28. Heat from Earth's core helps maintain the hot temperatures in the asthenosphere.
29. Minerals in the asthenosphere are expected to have a lower viscosity than the surrounding mantle.
30. Olivine, pyroxene, and garnet are major minerals found in the asthenosphere.
31. The thickness of the asthenosphere varies based on temperature, local stresses, and composition.
32. The roots of mid-ocean ridges penetrate down into the upper part of the asthenosphere.
33. Rising magma from the asthenosphere may erupt at divergent and convergent plate boundaries.
34. The asthenosphere provides a source of new mantle material into the lithosphere through upwellings.
35. The name "asthenosphere" means "weak sphere" in reference to its relatively weak and ductile nature.
36. Light elements like hydrogen may enhance the weakness of minerals within the asthenosphere.
37. Asthenospheric flow helps drive sea-floor spreading at mid-ocean ridges and subduction at trenches.
38. Mantle plumes provide evidence for large-scale convection currents within the Earth's asthenosphere.
39. The low viscosity and high temperatures of the asthenosphere allow for the observed mantle convection.
40. Models of asthenospheric flow help explain patterns of seafloor spreading and hotspot tracks on Earth.
41. Asthenospheric flow may be driven largely by thermal buoyancy within the Earth's mantle.
42. Deformation of the asthenosphere occurs under very high temperatures and pressures.
43. Melting within the asthenosphere occurs mainly due to adiabatic decompression of rising mantle materials.
44. The asthenosphere provides an important linkage between mantle convection and plate tectonics processes.
45. Current theories propose that mantle plumes originate in the uppermost regions of the asthenosphere.
46. Wind and tidal stresses deform the upper part of the asthenosphere near the base of the lithosphere.
47. Shearing within the asthenosphere may lead to localized partial melting and magma generation.
48. Heat transfer between the lithosphere and asthenosphere helps regulate the rates of plate motion.
49. The exact composition and dynamics of the asthenosphere are still not fully understood.
50. Seismic heterogeneities exist within the upper portion of the asthenosphere below some plate boundaries.
51. The asthenosphere facilitates the migration of chemical components within the convecting mantle.
52. The existence of the asthenosphere explains how plates can move independently of each other.
53. Fluids may play an important role in lowering the viscosity of the partially molten asthenosphere.
54. The mechanical properties of the asthenosphere control the generation, storage, and transport of magmas.
55. The mantle plume hypothesis posits that many hotspot volcanoes originate from the asthenosphere.
56. Asthenospheric materials may eventually be subducted into the deep mantle through plate tectonics.
57. Study of the asthenosphere improves our understanding of mantle convection, plate tectonics, and volcanism.
58. The asthenosphere represents a transitional zone between the rigid lithosphere above and convecting mantle below.
59. Asthenospheric flow is responsible for creating and opening ocean basins through seafloor spreading.
60. Deeper probing of the asthenosphere will require advances in seismic and geophysical imaging technologies.