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The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. From Wikimedia Commons, the free media repository.
Price January 30, Articles with short description All articles with unsourced statements Articles with unsourced statements from August Structure of the Earth. From Wikipedia, the free encyclopedia. Structure of the Earth.
Earth’s eccentric magnetic field”. P-wave velocities are much slower in the outer core than in the deep mantle while S-waves do not exist at all in the liquid portion of the core. This variation is surprising, since lateral temperature variations along the inner-core boundary are known to be extremely small this conclusion is confidently constrained by magnetic field observations.
Speculation also continues that the inner core might have exhibited a variety of internal deformation patterns. There is an East—West asymmetry in the inner discontibuidad seismological data.
The Earth’s inner core is thought to be slowly growing as the liquid outer core at the boundary with the inner core cools and solidifies due to the gradual cooling of the Earth’s interior about degrees Celsius per billion years. Archived from the original on Retrieved 30 August If true, this lhmann mean that the Earth’s solid inner core is not a primordial feature that was present during the planet’s formation, but a feature younger than discontinhidad Earth the Earth is about 4.
Even though it is growing into liquid, it is solid, due to the very high pressure that keeps it compacted together even if the temperature is extremely high.
For the cores of other planetary bodies, see Planetary core. S waves shear material, and cannot transmit through liquids, so it is thought that the unit above the discontinuity is solid, while the unit below is duscontinuidad a liquid or molten form. This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it.
The Earth’s inner core is the Earth’s innermost part. Geophysics Structure of the Earth. This page was last edited on 9 Aprilat Summary [ edit ] Description Slice earth.
The boundary is observed via the discontinuity in seismic wave velocities at that depth due to the differences between the acoustic impedances of the solid mantle and the molten outer core. This may be necessary to explain why seismic waves pass more rapidly in some directions than in others.
Further, if the primordial and mostly fluid still forming earth contained any significant mass es of elements denser than iron and nickel, namely the white appearance precious metals and a few others except silver, specifically the siderophile elementsthen these would necessarily have differentiated to the very center of the core into concentric nested spheres by planetary differentiationwith the most dense and stablei.
Schematische doorsnede van de aarde continentale korst oceanische dlscontinuidad bovenmantel buitenmantel ondermantel binnenmantel buitenkern bovenkern binnenkern A: The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. Description Slice earth ES.
Lehmann y su discontinuidad Wiechert – Lehmann – CALAMEO Downloader
East—west asymmetry in inner-core growth and magnetic field generation. Width pt Height pt. Earth and Planetary Science Letters. Discontinuidad de Lehmann D: Dziewonski and Gilbert established that measurements of normal modes of vibration of Earth caused by large earthquakes were consistent with a liquid outer core.
It was even suggested that Earth’s inner core might be a single crystal of iron. There is a model which explains this by differences at the surface of the inner core — melting in one hemisphere and crystallization in the other. Based on rates of cooling of the core, it is estimated that the current solid inner core started solidifying approximately 0.
Yoshida and colleagues proposed a novel mechanism whereby deformation of the inner core can be caused by a higher rate of freezing at the equator than at polar latitudes,  and S. This page was last edited on 14 Julyat The Earth was discovered to have a solid inner core distinct from its molten outer core inby the Danish seismologist Inge Lehmann who deduced its presence by studying seismograms from earthquakes in New Zealand.