What are the main resources of trade in West African during the
Kingdoms?

Mineral resources-gold and salt-were the major reason for the trade that built the wealth and power of the West African kingdoms of Ghana, Mali, and Songhai. The locations of these king- doms gave them access to generous supplies of both these valuable resources. -G00gle

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The main resources of trade in West African during the

Kingdoms were gold and salt

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.