summarize this into 2 sentences 

NAME_1 also documented a small number of meteorite craters, most of which were quite pristine, suggesting that NAME_2’ current surface is relatively fresh, around 500 million years old. Many think this overhaul happened in a planetwide volcanic event, perhaps on par with the end-Permian extinction that wiped out most species on our Pale Blue Dot. Volcanism on Earth is linked to plate tectonics; however, scientists have yet to find evidence of NAME_2’ crust shifting, so what drives its eruptive properties remains opaque. In your response, capitalize a few words to stress main points. Please limit the number of words with all capital letters to less than 15.
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