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A 40g sample of rock is studied in the lab. Geologists find that the sample is 3.75 billion years old. How much argon-40 is there in this sample?
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In 2002, the rare earth elements mine in mountain pass, california was closed because
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A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction
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A 40g sample of rock is studied in the lab. Geologists find that the sample is 3.75 billion years ol...
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