Internet in plain English by Pfaffenberger. New York, M.I.S. Press, 1994. The weight of the earth is calculated from using the parameters of an ellipsoid adopted by the International Astronomical Union in 1964 and recognised by the International Union of Geodesy and Geophysics in 1967in which the area of the ellipsoid is 196,938,800 square miles. Science and Technology Desk Reference. Gale Research 1993.p.227 0810388847.
Magnetism is a force that electric currents exert on other electric currents.
It may be created by the motion of electrons in the atoms of certain materials, which are called magnets. Magnetism and electricity are closely related. Together, they make a force called electromagnetism, one of the basic forces of the universe. Atoms have a small, dense centre called a nucleus surrounded by one or more lighter, negatively charged electrons. Nuclei consist of protons, which have positive charges, and neutrons which have no charge.