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He wrote many books of different Greek & Latin theories. He worked with maps & the movement of the Earth, he tried to explain many research in his books.
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He decided not to believe in anything that the books said & decided to do most of the reasearch himself. He used geometry to show that contracting muscles change its shape but not the volume. He realized that there were rocks falling from the moon & decided to call them 'moon rocks'.
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He created the theory of Earth or an investigation of the Laws Observable in the Composition, Dissolution, & Restoration.
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He created the theory of tectonic plates, providing a mathematical model for convection in the mantle explaining the movement of the Earth's crust.
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He performed the first uranium-lead radiometric dating (designed to measure the age of a rock). His theory was also part of the 'Continental Drift'. He thought that the drift was because of the thermal expansion in the Earth's mantle.
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He explained the movement of the tectonic plates & why they moved. He tried to explain to others what was happening by writing in his books & by also using other scientist's theories along with his. His result of his research was his first paper on plate tectonics.
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He advanced the 'Tectonic Plate' theory. He said that the Earth's crust moved laterally away from long, volcanically active ocean ridges.