Describe the stone tools of the …

The Neolithic Period, or New Stone Age, the age of the ground tool, is defined by the advent around 7000 bce of ground and polished celts (ax and adz heads) as well as similarly treated chisels and gouges, often made of such stones as jadeite, diorite, or schist, all harder than flint. Beyond weapons and basic necessities, Stone Age people invented new technology for farming, particularly in the Neolithic Age when they became a more settled people. One of the most important inventions was irrigation canals, which helped them water and grow crops en masse. The Stone Age was a broad prehistoric period during which stone was widely used to make implements with an edge, a point, or a percussion surface. The period lasted for roughly 3.4 million years, and ended between 8700 BCE and 2000 BCE, with the advent of metalworking.