Structure of the Earth | Wikipedia audio article

This is an audio version of the Wikipedia Article:


00:00:43 1 Mass
00:01:17 2 Structure
00:02:30 2.1 Crust
00:04:31 2.2 Mantle
00:06:17 2.3 Core
00:12:25 3 See also



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SUMMARY
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The internal structure of the Earth is layered in spherical shells: an outer silicate solid crust, a highly viscous asthenosphere and mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core. Scientific understanding of the internal structure of the Earth is based on observations of topography and bathymetry, observations of rock in outcrop, samples brought to the surface from greater depths by volcanoes or volcanic activity, analysis of the seismic waves that pass through the Earth, measurements of the gravitational and magnetic fields of the Earth, and experiments with crystalline solids at pressures and temperatures characteristic of the Earth's deep interior.