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Originally Posted by Wicked_and_Crazy
12 measure magnetic forces googled
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At last, well it actually measures variance in magnetic force and not the actual force itself. It one of the ways they found that the Earths magnetic field has reversed before. From the mid-atlantic ridge outwards there are magnetic stripes of rock with reverse polarities.
---------- Post added at 22:00 ---------- Previous post was at 21:58 ----------
I make 7, 9 16 and 20 to be the ones left.