Earth isn’t alone: Venus once had plate tectonics, too
Earth is the only planet with plate tectonics today.
But billions of years ago, Venus had them, too... maybe even before Earth did!
https://bigthink.com/starts-with-a-bang/earth-venus-plate-tectonics/
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Is there not also evidence of lava flow on Mars, esp if Olympus Mons is a volcano it would indicate that there is a liquid layer under the crust.
