III. Theories of major movements of the lithosphere - continental drift - plate tectonics and sea floor fl spreading di A. Theory of Continental Drift 1. positions of continents have changed through Earth’s history 2 proposed in 1912 2. by Wegener Pangaea ESRT page 5 5 3. evidence: a. fit of continents b. similar geologic structures that line up when continents are put together ex. mtn ranges ex. mineral p deposits ex glacial striations ex. c. similar fossils of land animals and plants 4 problems with Wegener 4. Wegener’ss theory a. How do the continents move? b. What about the ocean crust? B. Theory of Plate Tectonics 1. proposed in the 1960s 2. Earth’s lithosphere p divided into a dozen+ solid but moving pieces = plates
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