Witryna20 sty 2011 · The structure of the mantle has been difficult to evaluate on account of the complexity of interpreting the lunar seismograms. From MOI considerations alone we know it is largely homogeneous at least in density. The average P-wave velocity is 7.7 km/s and the average S-wave velocity is 4.45 km/s down to about 1200 km. WitrynaThe asthenosphere (from Ancient Greek ἀσθενός (asthenós) 'without strength') is the mechanically weak [1] and ductile region of the upper mantle of Earth. It lies below the lithosphere, at a depth between ~80 and 200 km (50 and 120 mi) below the surface, and extends as deep as 700 km (430 mi).
seismic - Why do P waves have a higher velocity in the …
Witryna14 lut 2024 · Motion within the mantle is responsible for deep crustal stretching ( extension) and compression. Motion in the mantle is produced by gravitational heat convection —hot rocks expand and rise whereas cooler (hence denser) rocks sink. Thicker, less dense, continental crust floats higher than thinner, denser ocean crust … Witryna8 wrz 2024 · Temperature and density differences in the mantle cause convection currents. Magma deep in the mantle rises due to its increased temperature, bringing hot magma towards the asthenosphere. skinner transportation wi
What is the density of lower mantle? - Reimagining Education
WitrynaOceanic crust has a relatively high density, especially when cold and old, and composition similar to basalt. The surface levels of crust are relatively brittle. The … WitrynaThe mantle density suggests abundance of phyllosilicate with little or no dehydration. However, a small, deep core rich in metal cannot be excluded ( King et al., 2024) and is expected from the deficit in iron in Ceres’ regolith inferred from the Dawn gamma ray and neutron detector ( Prettyman et al., 2024 ). Witryna2 dni temu · In addition to matching the core’s density and the mantle’s oxidation state, their calculations produced one to three ‘oceans’ of water, where one ocean is the total amount of water on ... swan lake funeral directors