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Home Q & A Board Science-Related Homework Help Physics
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staedtler staedtler
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7 years ago
Solar magnetic activity at the present time in history seems to vary almost periodically with a time-scale of
   A)  100 years.    B)  5 minutes.    C)  22 years.    D)  2 years.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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discovererdiscoverer
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7 years ago
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staedtler Author
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#2
6 years ago
On behalf of my study group and I, thank you
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