extrusive

Noun

(geology) Rock which has been formed through volcanic extrusion.

Japanese Meaning

（地質学）火山の噴出作用により形成された岩石

At the outcrop, the geologist carefully sampled an extrusive and recorded its texture and composition.

その露頭で、地質学者は噴出岩を注意深く採取し、その組織と組成を記録した。

Sense（1）

(geology) Rock which has been formed through volcanic extrusion.

extrusives

（ plural ）