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Yeah. That's one of those test questions that makes me bonkers. You know they want you to say solar but as you pointed out the moon has a big effect on the tides. ("You can't explain that" -Bill O-Reilly, sooper genius) The real correct answer is probably extraterrestrial.
Actually, now that I think about it, the real answer is that no energy is really renewable, it's only changeable but that's on the physics tests not the eco test.
Well, I hope you passed anyway.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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