In working with my kids at SVJH in Gilroy, I had one student ask the
following:

He was doing an experiment to determine the amount of iron in the sand
at various beaches. He noted that sand from a beach in the state of
Washington had about 5 times as much iron as one from Santa Cruz, CA.
His conclusion was that the closer you get to the N or S pole, the
stronger the magnetic field, and that's why there is more iron in the
sand the further north you go.

So what do I tell him.....      Thanks Jan


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