can any of you answer this?

[redriderno22]

i dont understand why?

everything has something in it that can have its polarity rearranged?

doesn't every atom have an electron shell? that would have a polarity?

[erickdt]

An interesting read:

http://en.wikipedia.org/wiki/Magnetism

[Kul_ash]

i dont understand why?

everything has something in it that can have its polarity rearranged?

doesn't every atom have an electron shell? that would have a polarity?

Yes exactly! Even they do have same compostion as a matter every where, they do not have "magentism" property in them! Thats why they can not rearrange their polarity. It is a property of only few metals and thats why they are used in magentism!
Every matter though same, it is a nature of its molecules which makes every substance different from each other!

[redriderno22]

but what if the earth did not have a iron nickel core?

with the same mass

and less of a magnetic field?

hard to prove!

[craigmkd]

all good ideas!

but it has to be more simple

one common thing that ties it all together

light,electricity,magnetism,gravity,heat, cold.............

what that is?

who knows?

I'm sure many people have given theory's?

'Particle Wave Physics'   It's not simple. Here is one site of many thousands. I misspoke earlier about theory -
It's an entire science obviously loaded with infinite theory.

http://www.spaceandmotion.com/Physics-Particle-Wave-Duality-Paradox.htm