Russia and what are located to the north of China

▪Russia and what are located to the north of China

➢ The China–Russian border consists of two non-contiguous sections separated: the long eastern section between Mongolia and North Korea and the much shorter western section between Kazakhstan and Mongolia.

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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.