/u/StezzerLolz's posts in /r/askscience
What causes land to be land, and oceans ocean? Why are some tectonic plates oceanic, and others continental? And why are some plates split roughly half and half?
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If humanity were wiped out in some huge catastrophe, what would be left for some future species to discover 5 million years from now? How about 65 million years from now?
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