I'm not completely sure but i think a chisel or a hammer
If you're asking what volcanic rock can be sharpened as a cutting tool, the answer is obsidian.
the plow
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A chain breaker tool is used to break a chain on a bicycle, but the same tool is used to fix the chain. This type of tool may be purchased at Northern Tool, Elite Gates, Superstore and Harbor Freight.
All tools help humans (and rarely, animals) to perform tasks. So pick a tool, any tool. Then think about how you use it. That's a method of using it. If the task you need to perform is to safely knock down a wasp's nest, the tool you want may be a rock, and your method of using it is to throw it at the wasp's nest.
A pickaxe was used in mining to break up and loosen hard rock or ore so that it could be easily removed. Miners would use the pickaxe to chip away at the rock face, making it easier to extract valuable minerals like gold, silver, or coal. The pickaxe was a fundamental tool for miners in both underground and surface mining operations.
Blasting is the use of explosives to break rock as one step in mining. Sometimes explosives are used to break AND move rock to one side- to permit the mining of what was under the rock. THAT is cast blasting. Rock is cast aside.
One of the first important farming tools used to break soil is the plow. It helps to turn over the soil, aerate it, and create furrows for planting seeds. Plows have been used for centuries to prepare the land for cultivation.
a volcanis rock that was used as a knife or a small cutting tool
they used a sponge and a tool that could brake rock. also they used spit to narrow it out
There is no specific event that triggered tooling making. It is believed that a rock used to crush/break bone to access meat and marrow may have been the first. following that man made tools to do simple tasks, many of teh tool were not invented but found by accident. The greatest reason for using tool thereafter was survival