Not all erupted out of a conical volcano, but were spread across the face of the earth in a “volcanic” fashion. So where do geologists conclude rocks originate from if not via a volcanic mechanism?
The "volcanic" rocks are those which are extrusive. Most Igneous rocks are intrusive, cooled below ground and over the course of time, with the above ground having been eroded away, were exposed to the surface.
Igneous and volcanic are not synonyms
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