Inner core - Wikipedia, the free encyclopedia
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The inner core of the Earth, its innermost hottest part as detected by seismological studies, is a primarily solid sphere about 1220 kilometer in radius, only about 70% that of the Moon. It is belie...
en.wikipedia.org/wiki/Inner_core
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Outer core - Wikipedia, the free encyclopedia
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The outer core of the Earth is a liquid layer about 2,260 km thick composed of iron and nickel which lies above the Earth's solid inner core and below its mantle. Its outer boundary lies approximate...
en.wikipedia.org/wiki/Outer_core
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Traveling still deeper within the Earth, we next would encounter the Earth’s outer core, which extends to a depth of around 3000 miles beneath the surface. It is believed that this outer core is made up of super-heated liquid molten lava. ... Earth's Inner Core...
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www.kidsgeo.com/geology-for-kids/0023-earths-outer-core...
www.kidsgeo.com/geology-for-kids/0023-earths-outer-core.php
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Data from earthquake waves, rotations and inertia of the whole Earth, magnetic-field dynamo theory, and laboratory experiments on melting and alloying of iron all contribute to the identification of the composition of the inner and outer core.
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pubs.usgs.gov/gip/interior/
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Unlike the yolk of an egg, however, the Earth's core is actually made up of two distinct parts: a 2,200 km-thick liquid outer core and a 1,250 km-thick solid inner core. As the Earth rotates, the liquid outer core spins, creating the Earth's magnetic field.
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pubs.usgs.gov/publications/text/inside.html
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The inner part of the earth is the core. This part of the earth is about 1,800 miles (2,900 km) below the earth's surface. The core is a dense ball of the elements iron and nickel. It is divided into two layers, the inner core and the outer core.
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mediatheek.thinkquest.nl/~ll125/en/core.htm
mediatheek.thinkquest.nl/~ll125/en/core.htm
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Provides links to USGS information about inner core (earth) and related topics. Provides a topical browse interface into USGS information utilizing controlled vocabularies arranged as formal thesauri. ... The solid interior part of the earth's core, presumed to be composed principally of iron with an alloy of about 10...
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www.usgs.gov/science/science.php?term=590&order=alpha
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SOLIDITY of the inner core was originally inferred on the basis of the assumption that the inner core has the same composition as the surrounding material of the outer core1.
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www.nature.com/nature/journal/v234/n5330/abs/234465a0.h...
www.nature.com/nature/journal/v234/n5330/abs/234465a0.html
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We suspect that the core of the Earth is hot based on indirect evidence. This is so because no one has ever been deep into the earth. Even deep drilling has only gone down a number of miles (probably less than 10). I personally found out one form of evidence when I went into a deep mine in Montana....
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www.madsci.org/posts/archives/mar99/922122351.Es.r.html
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