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Thought America, eurasia, and africa were once joined and were separated by floods and earthquakes.
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The Law of Superposition: That newer layers form atop older layers.
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The geoloical forces at work in the present day are the same as those that operated in the past. e used Steno's laws to develope this theory.
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Continental drif theory: Noticed that there were different glacial deposits in South America and Africa. Fossils often indicate a cimate very different from the climate of today.
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He predicted that convection currents within the Earth's mantle are driven by radioactive heat might furnish the mechanism for the Continental drift theory.
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Came up with the sea floor spreading theory. Idea that the seafloor itself moves and carries continents with it as it expands from a central point.
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Theory of plate tectonics-combination of continental drift and sea floor spreading
