Have you ever considered air pollution when thinking about someplace you'd like to live, or live currently? If the air pollution here in Killeen was as bad as in other cities, what would you do? Why do you think the people in those cities don't leave?

I would come up with a plan to help decrease pollution and be like: "Ey if you want to live in (insert city) Then we can make this city like that."

Explanation:

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.