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When did plate tectonics begin?
Earth surface is covered with rigid plates that move, crash into each other and dive into the planet's interior. But when did ...
That's when the geological record reveals plentiful ophiolites — bits of oceanic crust shoved onto continents — and blueschists, which are metamorphic rocks that form in subduction zones ...
Key Laboratory of Western Mineral Resources and Geological Engineering, MOE, School of Earth Science and Resources, Chang’an University, Xi’an, China State Key Laboratory of Continental Dynamics, ...