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  5. To trace the series of these revolutions, to explain their...

To trace the series of these revolutions, to explain their causes, and thus to connect together all the indications of change that are found in the mineral kingdom, is the proper object of a THEORY OF THE EARTH.

John Playfair
Science, Together, Earth
John Playfair, James George Playfair (1822). “Biographical memoir. Illustrations of the Huttonian theory of the earth”, p.20
To trace the series of these revolutions, to explain their causes, and thus to connect together all the indications of change that are found in the mineral kingdom, is the proper object of a THEORY OF THE EARTH.