What was the primary difference between segregation in the North and segregation in the South?

Segregation was never mandated by law in the Northern states, but a de facto system grew for schools, in which nearly all black students attended schools that were nearly all-black. In the South, white schools had only white pupils and teachers, while black schools had only black teachers and black students.

Explanation:

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.