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Excerpt from Geology of to-Day: A Popular Introduction in Simple Language
These limitations render it advisable to exclude or give but brief consideration to various problems of great current interest. For example, many most interesting suggestions have been made to explain mountain formation and the origin Of the internal heat of the earth by the phenomena of radio-activity. The nature of radium and the methods by which radio-activity are measured can only be explained by the introduction of advanced physics Which would take much Space to interpret. Moreover, the literature of the subject during the past few years has been marked by so many rapid changes of view, and many of the results are so inconsistent, that the popular discussion of their bear ings on geology may be delayed until the physicists have reached some more definite conclusions about the facts Of radio-activity which bear upon geological problems. The contributions to radio-active geology have already been very helpful; but this new branch of science is still so speculative that geologists may be excused from any immediate modification of their fundamental principles.
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