There are several agents that are able to cut rock. Some of cutting agents that can be used to cut rock are: epsom and also crystal.
Abrasion.
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Abrasion.
abrasion
Abrasion.
Abrasion.
Abrasion.
The action of abrasion can best be described as windblown sand cutting and polishing exposed rock surfaces
It is called abrasion.
The law of cross-cutting relationships.
If you're asking what volcanic rock can be sharpened as a cutting tool, the answer is obsidian.
Metamorphic rock