volcanic pipe

1. A vertical conduit below a volcano through which magma has passed and that has become filled with solidified magma, volcanic breccia, and fragments of older rock.

Example Sentences

Only a bare handful even knew that the diamonds occurred only in a small volcanic pipe on the western slope.

From Project Gutenberg

There was intermittent fighting around the volcanic pipe, the police reported.

From Project Gutenberg

Evidently Guevara had put a ring of men around the volcanic pipe and planned to hold it by force of arms.

From Project Gutenberg

At Ruby Hill near Bingara they were found in a breccia filling a volcanic pipe.

From Project Gutenberg

A shelter had been erected on one side of the volcanic pipe.

From Project Gutenberg