johannahtravis johannahtravis

25-01-2017
Biology

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What have scientists observed in order to learn about earths interior?

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madelynn32 madelynn32

25-01-2017

I haven't learned that but I would tell you if I knew

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SteveUrcle11 SteveUrcle11

26-01-2017

They have observed how radio signals move through the middle of earth to find the density of the metal.

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