Difference between revisions of "Dictionary:Core"

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# A rock sample cut from a borehole or retrieved from the sea floor. See [[Special:MyLanguage/Dictionary:core_analysis|''core analysis'']].  
 
# A rock sample cut from a borehole or retrieved from the sea floor. See [[Special:MyLanguage/Dictionary:core_analysis|''core analysis'']].  
 
# The Earth's core is the central portion bounded by the Gutenberg discontinuity (&#x2248;2900 km deep) that separates it from the mantle. The core&#x2019;s radius is &#x2248;3500 km; it is presumed to be composed predominantly of iron and silicates. See Figure [[Special:MyLanguage/Dictionary:Fig_E-1|E-1]]. Divided into '''outer core''' (which will not transmit S-waves) and '''inner core''', the radius of the inner core being about 1220 km. The inner core was discovered by [[Special:MyLanguage/Inge Lehmann|Inge Lehmann]] in 1936.
 
# The Earth's core is the central portion bounded by the Gutenberg discontinuity (&#x2248;2900 km deep) that separates it from the mantle. The core&#x2019;s radius is &#x2248;3500 km; it is presumed to be composed predominantly of iron and silicates. See Figure [[Special:MyLanguage/Dictionary:Fig_E-1|E-1]]. Divided into '''outer core''' (which will not transmit S-waves) and '''inner core''', the radius of the inner core being about 1220 km. The inner core was discovered by [[Special:MyLanguage/Inge Lehmann|Inge Lehmann]] in 1936.

Latest revision as of 10:25, 8 December 2017

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  1. A rock sample cut from a borehole or retrieved from the sea floor. See core analysis.
  2. The Earth's core is the central portion bounded by the Gutenberg discontinuity (≈2900 km deep) that separates it from the mantle. The core’s radius is ≈3500 km; it is presumed to be composed predominantly of iron and silicates. See Figure E-1. Divided into outer core (which will not transmit S-waves) and inner core, the radius of the inner core being about 1220 km. The inner core was discovered by Inge Lehmann in 1936.
  3. A material of high magnetic permeability placed in the center of a coil of wire. Used in the flux-gate magnetometer for measuring magnetic fields.
  4. A magnetic core (q.v.) is a device that used to be used in rapid-access memories.