Enlightenment is actually one of the factors that the Declaration of Independence was modeled after. The Declaration of Independence is what started the revolution. The Brittians heard of the declaration, and didn't want Americans to be independent on their own land.
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It is because of subduction<span>: oceanic crust tends to get colder and denser with age as it spreads off the mid-ocean ridges. It gets so dense, that it sinks in the upper </span><span>mantle </span><span>(subduction). This is like a giant recycling system for oceanic lithosphere! Because continental crust is lighter than oceanic crust, continental crust cannot subduct. We therefore still have some very </span>old continental rocks<span> at the surface of the Earth.</span>