Is a classification system devised by c. j. thomsen for the sequence of technological periods (stone, bronze, and iron) in old world prehistory. it established the principle that by classifying artifacts, one could produce chronological ordering.

Three Age system

Explanation:

Christian Jurgensen Thompson was a Danish antiquarian known for the development of early archaeological techniques. He is credited with the introduction of three age systems and dividing prehistory into three periods based on tool-making techniques, Stone Age, Iron age, and Bronze Age. Although this system is useful in European context, it is of no use for establishing the chronological frameworks in the Americas, Asia, and Sub-Saharan Africa.

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explanation:

the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.