Well I'm sure many a time you've seen on some science experiment someone wrap a copper wire around a nail well thats generally the idea for electromagnets you get a solid piece of iron which is the only metal that is magnetic and you wrap a copper wire around it and the idea is to make two opposing magnetic poles by aligning the molecules with a electrical charge (a battery) so now with all three pieces assembles you have a copper wire attached to two sides of a battery and wrapped around a nail
The distance from the nucleus at which the electron is most likely to be found
Muscles bones no on organs and no on skin
Chemical weathering is the weakening and subsequent disintegration of rock by chemical reactions.