| Name _______________ |
Date
_____________
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Bank
On It! Worksheet
Magnetism
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Work
Bank
stars) stroked
power stones
Europe. The physician
and Chinese
the from away
A around
the
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____________ ancient Greeks, originally those near
____________ city of Magnesia, and also the early Chinese knew about
strange and rare ____________ (possibly chunks of iron ore struck by
lightning) with the ____________ to attract iron. ____________ steel
needle ____________ with such a "lodestone" became "magnetic" as well,
____________ around 1000 the ____________ found that such a needle,
when freely suspended, pointed north-south. The magnetic compass soon
spread to ____________ Columbus used it when he crossed the Atlantic
ocean, noting not only that the needle deviated slightly from exact
north (as indicated by ____________ ____________ but also that the deviation
changed during the voyage. Around 1600 William Gilbert, ____________
to Queen Elizabeth I of England, proposed an explanation: the Earth
itself was a giant magnet, with its magnetic poles some distance ____________
____________ its geographic ones (i.e. near the points defining the
axis ____________ which the Earth turns).
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