The Stone Age is the age when man used stone, especially flint for most of his tools. Flint is quartz (SiO2), very hard and has sharp edges. So it is usefull for many things: knifes, axes, scrapers and much more.
The way how flint is used to produce tools depends on the knowledge of man, and was developed during the Stone Age. So this age is divided into three periods which are defined by the abilities of man.
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