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first there are 3 peaces of finding the circumference of the planet, first the rotation speed the time of a day and of coarse the circumference the answers are 10000 mph, 24 hours, 240000 miles. then you need to know the % of the core to the planet (size) 30% and then what is 30% of 240000=(your answer)

That's not really answering the question. I think it is the earthquakes.

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12y ago

What else can I help you with?