Earth's inner core | Wikipedia audio article

This is an audio version of the Wikipedia Article:


00:00:58 1 Discovery
00:03:14 2 Data sources
00:03:23 2.1 Seismic waves
00:05:52 2.2 Other sources
00:06:57 3 Physical properties
00:07:08 3.1 Seismic wave velocity
00:08:08 3.2 Size and shape
00:09:28 3.3 Pressure and gravity
00:10:09 3.4 Density and mass
00:10:27 3.5 Temperature
00:11:21 3.6 Magnetic field
00:12:32 3.7 Viscosity
00:13:44 4 Composition
00:14:34 5 Structure
00:16:31 5.1 Axis-aligned anisotropy
00:16:59 5.2 Non-axial anisotropy
00:18:17 5.3 Causes of anisotropy
00:18:52 5.4 Multiple layers
00:20:58 5.5 Lateral variation
00:22:21 5.6 Other structure
00:23:37 6 Growth
00:24:10 7 Dynamics
00:25:05 8 Age
00:27:31 8.1 Thermodynamic evidence
00:28:28 8.2 Paleomagnetic evidence
00:30:51 9 See also
00:33:26 10 References



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SUMMARY
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Earth's inner core is the innermost geologic layer of the Earth. It is primarily a solid ball with a radius of about 1,220 kilometres (760 miles), which is about 20% of the Earth's radius and 70% of the Moon's radius.There are no samples of the Earth’s core available for direct measurement, as there are for the Earth's mantle. The information that we have about it mostly comes from analysis of seismic waves and the magnetic field. The inner core is believed to be composed of an iron–nickel alloy with some other elements. The temperature at the inner core's surface is estimated to be approximately 5,700 K (5,430 °C) or 9806 °F, which is about the temperature at the surface of the Sun.