Why do they call it stone age?

Question

Why do they call it stone age?

Answer 1

bcoz its an age where they used stone for practically everything, stone tools, stone weapons, stone housing, stone furniture etc

Stone was available and they hadnt discovered iron and bronze etc so stone was the hardest and available type of material

Answer 2

Stone age, The Iron age ?

This dosent ring a bell?

Im guessing this age is like the plastic age? lol