How many popular elections are held every Presidential election year?
-51
-2
-50
-1

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.

19th amendment granted women the right to vote. the 19th amendment guarantees all american women the right to vote.