Quote:
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Originally Posted by aurora
Quote:
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Originally Posted by milli360
Quote:
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Originally Posted by aurora
The problem is that Earth is the only planet we know of that has ongoing plate tectonics, and it is hard to be certain of much when your sample size is = 1.
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Or nine.  |
But only 1 with tectonics. So it is hard to say just which features are crucial for it to happen. |
Well, you need the others to tell you which ones aren't. Which is why I say the sample size is nine--even more if you count the larger moons.