The three terms are often considered as similar but theses ages are different and the characteristics are described below.
Stone age is the time of the 10,000 B.C which is almost 2.5 million years ago, Human used to live in caves and simple huts. They hunted for their food and had simple stone and bones as tools and weapons.
New Stone Age is the time when the humans started growing their food in the form of crops, they made great progress in this era. This is the time when humans started using domestic animals. This was the duration between the 10,000 B.C and 4,500 B.C.
Age of Metal is mainly divided into three ages iron age, copper age and bronze age. The duration is 3200-1 B.C.E. This is the age when humans started making tools and weapons. They also made clay pottery, which helped them in cutlery.
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