Hypotheses on the development of the earth

Abstract

The hypotheses that have been made as to the evolution of the earth involve a great many assumptions. In general there are four groups of these: the condition of the earth at the moment when the assumed forces began to act, the forces themselves, the mode of action of the forces and the condition of the interior of the earth today.

The usual method has been to search for a single force that might have effected all the changes in the earth's crust, and then to try to explain all of them by this one force. But that method, of which the best example is the hypothesis of contraction, is not sound. We must try to find out all the forces that can produce changes in the structure of the earth and the effects themselves. Only by applying this method can we solve our problem.

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