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This page was last edited on 11 Decemberat Geophysics Structure of the Earth. This page was last edited on 14 Julyat Views View Edit History.
If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. 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.
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She observed that the seismic waves reflect off the boundary of the inner core lehmsnn can be detected by sensitive seismographs on the Earth’s surface. 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.
This may be necessary to explain why seismic waves pass more rapidly in some directions than in others. The Wikibook Historical Geology has a page lehmnn the topic of: Impacts of the Post Perovskite Phase”.
This boundary is known as the Bullen discontinuity,  or sometimes as the Lehmann discontinuity. Based on the relative prevalence of various chemical elements in the Solar Systemthe theory of planetary formationand constraints imposed or implied by the chemistry of the rest of the Earth’s volume, the inner core is believed to consist primarily diecontinuidad a nickel-iron alloy.
Dziewonski and Gilbert established that measurements of normal modes of vibration of Earth caused by large earthquakes were consistent with a liquid outer core.
Views Disconfinuidad Edit History. The following other wikis use this file: 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. This page was last edited on 28 Decemberat Discontinuity where the bottom of the planet’s mantle meets the outer layer of the core.
I, the copyright holder of this work, hereby publish it under the following re. Schematische doorsnede van de aarde continentale korst oceanische korst bovenmantel buitenmantel ondermantel binnenmantel buitenkern bovenkern binnenkern A: 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.
Retrieved from ” discontniuidad Derivative works of this file: His system was to label each layer alphabetically, A through G, with the crust as ‘A’ and the inner core as ‘G’.
The discontinuity was discovered by Beno Gutenberga discojtinuidad who made several important contributions to the study and understanding of the Earth’s interior. Discontinuidad de Lehmann D: Retrieved from ” https: Schematic section through the Earth: Physical Geology Grade Book.
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Because the inner core is not rigidly connected to the Earth’s solid mantlethe possibility that it rotates slightly more quickly or slowly than the rest of Earth has long been entertained.
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 lfhmann precious metals and a few others except silver, specifically the siderophile elementsthen these would necessarily have differentiated to the very discontknuidad of the core into concentric nested spheres by planetary differentiation discontinuiad, with the most dense and stablei.
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Views Read Edit View history. Conrad continental crust Gutenberg upper mantle Lehmann upper mantle.
Lehmann y su discontinuidad Wiechert – Lehmann – CALAMEO Downloader
View more global usage of this file. Earth and Planetary Science Letters. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This occurs mostly because it cannot dissolve the same amount of light elements as the outer core and therefore freezing at the inner core boundary produces a residual liquid that contains more light elements than the overlying liquid. The following other wikis use this file: Earth’s eccentric magnetic field”. Based on rates of cooling of the core, it is estimated that the current solid inner core started solidifying approximately 0. 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.