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Obsidian
Volcanic glass, also called obsidian.
Obsidian
its used to make tools and jewlery
Obsidian
Obsidian is a naturally occurring volcanic form of glass.
I think there are more than two uses of volcanic rock. There are two FORMS of volcanic rock. One is pumice and the other is obsidian. Pumice is often used for landscaping, personal beauty uses (callus removal), etc. The other is obsidian. Obsidian is like glass and ancient people's used it for tools. Knives, arrowheads, and other tools that one would want to have a sharp edge are perfect uses of obsidian. In modern times, obsidian is used for jewelry, art, and even some modern day surgical tools. Check out geology.com if you have more questions about rocks...
Obsidian is an igneous rock.
Obsidian is in the Igneous rock group.
they used wood tools and steel tools and rock or stone tools
how can a blue obsidian rock be blue
thes tools were made of bone, wood, and rock