Answer:
It is supported by empirical evidence.
Explanation:
Science is an empirical study of the universe. In scientific studies, a large amount of supporting emperical evidence must be handy after the study in order to validate its results. Any study lacking in sufficient empirical backing is not a reliable basis for making valid scientific inferences.
The average weight of an atom of an element, formerly based on the
weight of one hydrogen atom taken as a unit or on 1/16 (0.0625) the
weight of an oxygen atom, but after 1961 based on 1/12 the weight of the
carbon-12 atom.
N=N/Na
----. N=nxNa=3x6.023x10^23=<span>1.8069e+24</span>
Lead is often used to block out radiation
I believe it is happening more towards the middle states of the US...
