Asthenosphere example sentences
Related (3): mantle, lithosphere, plasticity
"Asthenosphere" Example Sentences
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.