The movement of molten iron in earths core makes the planet act like a giant bar with one pole near the top of the planet and one pole near the bottom

The answer is "magnet". Hope this helped.  :)

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.