# The Center of the Earth

Of all regions of the earth none invites speculation more than that which lies beneath our feet, and in none is speculation more dangerous; yet, apart from speculation, it is little that we can say regarding the constitution of the interior of the earth. We know, with sufficient accuracy for most purposes, its size and shape: we know that its mean density is about 5½ times that of water, that the density must increase towards the centre, and that the temperature must be high, but beyond these facts little can be said to be known. Many theories of the earth have been propounded at different times: the central substance of the earth has been supposed to be fiery, fluid, solid, and gaseous in turn, till geologists have turned in despair from the subject, and become inclined to confine their attention to the outermost crust of the earth, leaving its centre as a playground for mathematicians.

## Notes:

Invites speculation and is the realm of mathematics, not observation.

Folksonomies: earth geology core

Taxonomies:
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/business and industrial/energy/oil/oil and gas prices (0.277263)

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Concepts:
Liquid (0.989245): dbpedia | freebase
Temperature (0.777349): dbpedia | freebase | opencyc
Geology (0.715737): dbpedia | freebase | opencyc
Earth (0.629890): dbpedia | freebase
Scientific method (0.613722): dbpedia | freebase
Ideal gas (0.596014): dbpedia | freebase
Solid (0.595998): dbpedia | freebase | opencyc
Psychology (0.588788): dbpedia | freebase | opencyc

The Constitution of the Interior of the Earth, as Revealed by Earthquakes
Periodicals>Journal Article:  Oldham, Richard Dixon (1906), The Constitution of the Interior of the Earth, as Revealed by Earthquakes, Quarterly Journal of the Geological Society , (1906), 62, 456., Retrieved on 2012-06-09