A____________ is an open cavity in a volcanic rock that was filled by a gas bubble when the lava was still mainly liquid.
A) xenocryst
B) porphyrocryst
C) vesicle
D) phenocryst

Question

Quizplus · Accepted Answer

A vesicle is indeed an open cavity in a volcanic rock that was originally filled by a gas bubble when the lava was still mainly liquid. These form as magma rises to the surface and gases within the magma form bubbles. When the magma solidifies, these bubbles are trapped, leaving the vesicles.

A____________ Is an Open Cavity in a Volcanic Rock That