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"The origin of the earth," geology schoolwork by Eve Drewelowe, March 1, 1922

Page 2

study of historical geology one is able to read far back. But the record of the past ages is obliterated when one attempts to go back to the beginning. Near the surface of the lithosphere the rocks have been broken, crushed and changed which makes it hard to read history there, and one cannot get to the interior regions. However,  in spite of these difficulties men have been studying the problem and have advanced three hypothesis for the origin of the earth.
The first hypothesis called the Nebular or Laplacian hypothesis was persented in the eighteenth century by Laplace and Kent; however a number of other men must also have worked on the same hypothesis. Geology was not a known science then. The problem was worked out from an astronomical study and viewpoint. This hypothesis begins with a gaseous nebula. It holds that the solar system was originally derived from a huge, rotating glowing spheroidal mass of gas, so hot that the materials of which the rocks of the earth were formed were expanded in the form of vapor gas, and occupied the whole space of the solar system. This nebula gradually cooled through radiation of the heat into space, and as it cooled the mass shrank. The shrinkage accelerated the rate of motion of rotation. The increased rate of rotation developed the equitorial bulge and as the bulging continued to grow the cooling and shrinking and rotation continued. This eventually led to a separation of an equitorial ring by the forces of gravity, pulling towards the center and centrifugal force, pulling away into space. This first ring sluffed off around the equitorial bulge at the extreme edge of the space originally occupied by the hot, spheroidal, rotating mass of gas or nebula. As the ring in turn coold and contracted it disrupted and its fragments aggregated into a

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study of historical geology one is able to read far back. But the record of the past ages is obliterated when one attempts to go back to the beginning. Near the surface of the lithosphere the rocks have been broken, crushed and changed which makes it hard to read history there, and one cannot get to the interior regions. However, in spite of these difficulties men have been studying the problem and have advanced three hypothesis for the origin of the earth. The first hypothesis called the Nebular or Laplacian hypothesis was persented in the eighteenth century by Laplace and Kent; however a number of other men must also have worked on the same hypothesis. Geology was not a known science then. The problem was worked out from an astronomical study and viewpoint. This hypothesis begins with a gaseous nebula. It holds that the solar system was originally derived from a huge, rotating glowing spheroidal mass of gas, so hot that the materials of which the rocks of the earth were formed were expanded in the form of vapor gas, and occupied the whole space of the solar system. This nebula gradually cooled through radiation of the heat into space, and as it cooled the mass shrank. The shrinkage accelerated the rate of motion of rotation. The increased rate of rotation developed the equitorial bulge and as the bulging continued to grow the cooling and shrinking and rotation continued. This eventually led to a separation of an equitorial ring by the forces of gravity, pulling towards the center and centrifugal force, pulling away into space. This first ring sluffed off around the equitorial bulge at the extreme edge of the space originally occupied by the hot, spheroidal, rotating mass of gas or nebula. As the ring in turn coold and contracted it disrupted and its fragments aggregated into a